Special Issue on Safety of Vulnerable Road Users
- Special Issue Review
- Open Access
The application of in-vehicle systems for elderly drivers
European Transport Research Review volume 2, pages 165–174 (2010)
In response to the rapidly ageing global population, the purpose of this paper is to identify the problems of elderly drivers and their relation to emerging in-vehicle technologies.
The method is three fold. Firstly, it reviews factors involved in the functional decline of elderly drivers. Secondly, it assesses the feedback and support capabilities of in-vehicle systems (IVSs) with the potential to assist elderly people to drive safely for longer and maintain their quality of life. Lastly, it describes a newly funded project, Social inclusion through Digital Economy (SiDE), which will demonstrate an innovative application of driving simulator technology to test and evaluate the impact of emerging invehicle systems on elderly drivers. This project intends to assess whether it makes them less vulnerable road users.
The paper concludes that IVSs providing feedback and support to elderly drivers have the potential to help them recognize their weakness and vulnerability as road users and improve their driving performance through the use of advice, alerts, warnings or active interventions.
In the UK, the ageing segment of the population is growing more rapidly than other age groups. The population of the current state pensionable age is expected to rise by 32% over the next 25 years from 11.8 million in 2008 to 15.6 million in 2033; and the number of people over 85 years is projected to more than double over the next 25 years from 1.3 million in 2008 to 3.3 million by 2033. The proportion of people aged 65 years and over is projected to increase from 16% in 2008 to 23% by 2033 . In Europe, the number of elderly people has tripled over the last 50 years and will more than triple again over the next 50 year period . The same trend is echoed in Canada, USA, Japan and the rest of the developed world. Meanwhile, the number of female elderly drivers has also increased dramatically in the last decade as more of these women started driving in later adulthood or became widowed, divorced or separated and did not have another driver available in the household [3, 4]. This trend will continue in the future and lead to a more even gender distribution among elderly drivers than in the past. These statistics show that the proportion of elderly drivers, particularly female elderly drivers, as a part of the driving population will increase globally and therefore special, targeted care for this segment of drivers should be identified and addressed.
Research suggests that elderly drivers are less accurate in judging speed and distance and have more difficulty with multi-tasking [5, 6]. Robertson and Vanlaar  report that in Canada elderly drivers account for 16% of road deaths and 7.8% of injuries—the second largest behind the 15–24 years group. The same study highlights a rate of 15.7 deaths per 100,000 for the 65 years and over group compared to a rate of 24.7 deaths per 100,000 of the population in the 15–24 years group and 9.6 in the 24–65 years age group . Li et al.  show that whilst the number of deaths per driver involved in crashes in the United States is lowest for those aged 16–19 years, it rises by almost fivefold for drivers aged over 80 years. However, in the same study, a measure of fragility can be found by comparing the number of road deaths per number of drivers involved in a crash (a measure of risk) and excessive crash involvement (i.e. drivers involved in crashes per vehicle-miles travelled (VMT)) showed that the rate of drivers involved in crashes per VMT was highest for those aged 16–19 years and falls rapidly until the 70–74 years age group when it rises again. Thus, although the under 24 years age group has a larger crash risk than the over 65 years age group, the over 65 group drives comparatively fewer miles than the under 24 age group, but are more likely to suffer more serious or even fatal injuries, thereby having a higher measure of fragility and vulnerability. Furthermore, elderly drivers also have a problem with maintaining a constant vehicle speed .
McGwin et al.,  showed that for drivers aged 65 years and older, the at-fault crash rate was 2.1 times higher for drivers who had been involved in a crash in the previous 4 years compared to those who had not, herefore an elderly person who has had a recent crash is more likely to have another one. This study also determined that at-fault drivers more often rated their driving as average or worse compared to not at-fault drivers. Habitual hazardous and critical errors highlighted in an Australian on-road driving assessment study of elderly drivers (aged between 60–86 years) showed that failing to check the blind spot, observe intersections and make critical observations (i.e. ‘failure to observe critical features of the driving environment that compromised safety including pedestrians on crossings, vehicles entering the flow of traffic, critical traffic signs or road markings’) were in the top four reported errors by the assessors . Physical intervention by the instructors resulting from critical driving errors were primarily committed by drivers negotiating intersections, along with failures in observations, gap selection and vehicle positioning .
Breker et al.  considered that elderly drivers are not often accident prone for the following reasons: they have a lower proportion of alcohol use when driving, use restraints more frequently and do not show signs of losing control over the vehicle in curves and straight sections. However, they are often involved in accidents at an intersection where fast information processing and quick reactions are required. AGILE (Aged people Integration, mobility, safety and quality of Life Enhancement through driving), a project funded by the European Commission Research Programme ‘Quality of Life’ Key Action ‘The Ageing Population’, conducted a survey with drivers in three age groups (55–64, 65–74, 75+) in 2001. The results indicate that the older the age group the person is in, the more often he/she is the following: the main driver in the household, legally responsible for accidents occurring recently, drives fewer miles monthly and is less open to external support such as special training and consultation courses . Gender differences are also found in driving behaviour. Compared to male elderly drivers, female elderly drivers tend to drive fewer mileages; have less driving experience both quantitatively and qualitatively; and are less often involved in or responsible for accidents [3, 4].
However, driving plays an important and essential role in maintaining elderly people’s mobility and independent living, enabling them to participate in their usual social activities and carry out practical day-to-day needs [7, 12–14]. From a psychological perspective, driving makes them feel younger, more confident and independent, whilst mobility increases their feeling of control, self-esteem, protection and prestige, enhances their status and helps them participate in work, education or social events and develop cognitive skills. Asking for lifts and the use of public transport could be alternatives to driving. However, UK Economic and Social Research Council (ESRC) research found that older people are exceedingly reluctant to ask family members or friends for lifts, even to hospital or doctor’s appointments, unless some kind of reciprocal relationship is involved . Gilhooly , AgeUK  and Brake [17–19] indicate that barriers to using public transport may exist, such as being physically inaccessible; a lack of covered waiting areas and toilets; the perception of being unsafe and unreliable, expensive and inconvenient; whilst very often services such as hospitals and cheaper out of town shopping centres are poorly served by public transport. In addition, many elderly people are not able to walk the required distance, stand for a long time or have the overall physical endurance to use public transport. Given that both car ownership and driving appear to be related to a higher quality of life, giving up driving can lead to reduced mobility, lack of freedom, loss of independence, unmet social and aesthetic needs, lower quality of life and eventually depression and isolation [12, 15].
This paper reviews factors involved in the functional decline of elderly drivers which is well-documented as the main cause of reduced driving ability. It goes on to assess the feedback and support capabilities of IVSs with the potential to assist elderly people to drive safely for longer and maintain their quality of life. Lastly, it describes a newly funded project, Social inclusion through Digital Economy (SiDE), which will demonstrate an innovative application of driving simulator technology to test and evaluate the impact on elderly drivers of emerging IVSs.
Functional decline of elderly drivers
Age-related functional decline in physical health (especially mobility, sight and hearing) and mental health can impact on driving ability and lead to misjudgements and errors whilst driving. Elderly people suffering from a decline in physical health—such as stiffer muscles, limited neck and upper body rotation and loss of upper limb strength—can affect their ability to move and operate the car safely [7, 20, 21]. People suffering from a decline in visual health such as blurred vision and photophobia can experience problems with distance vision and sensitivity to light and glare [20, 22, 23]. Age-related functional decline can also be caused by other medical issues including a stroke, heart disease or medications prescribed to treat a specific ailment or other illness [10, 12, 20, 22, 24]. People suffering from a decline in mental health, such as loss of confidence, memory, concentration and capability to process information, can be more susceptible to distraction, find it difficult to perform multi-tasking and difficult to understand road signs and travel information displayed on the dashboard [12, 20, 22, 25].
In order to compensate for functional decline, elderly drivers tend to drive less: this is possible as they no longer need to commute and travel to work after retirement [12, 26–28]. They deliberately avoid driving at night, in poor road conditions or other risky situations and places such as wet roads, rush hours, heavy traffic, unfamiliar roads and localities, bad weather or damaged roads: these practices all contribute to a reduction in the annual mileage driven [27, 29, 30]. They display a coping mechanism for easing the driving tasks by creating more time. This specific strategy allows them to cope with a reduced capability to process information and allows the task to be completed consciously rather than reactively [5, 31, 32]. This is usually achieved by slowing down before a manoeuvre (such as turning to cross a traffic lane). However, in certain situations, such as entering a high speed motorway, slowing down is not an effective coping mechanism and indeed it may contribute to increasing the risk of an accident. This risky behaviour can be compounded further by physical deficiencies such as reduced neck rotation which can commonly lead to a loss in ability to check the blind spot . They also tend to avoid right turns by taking routes that require left turns or routes where right turns have green-arrow signals [33–35].
Assistance needed to mitigate functional decline
In the literature there are several descriptions of elderly drivers and driving behaviours that can adversely affect driving or can limit the freedom to choose when to drive. Table 1, adapted from Davidse , shows a summary of the functional decline affecting elderly drivers and the assistance needed to overcome this functional decline. From this type of information it is possible to begin to scope out the features of assistance systems for elderly drivers.
As discussed earlier, the decline in capability of elderly drivers has contributed to the fact that—compared to middle aged drivers—elderly drivers are more often involved in traffic accidents, killed or seriously injured in accidents which involve other vehicles. Studies of individual developed countries in Europe, Asia and North America [36–39] document that elderly drivers do not represent an excessive risk or a threat to other road users. They are more likely to hurt themselves than to put others at risk. Hence, improving their driving performance has the potential to enhance their safety on the road and benefit the transport network as a whole.
In-vehicle assistive technologies are available to address elderly drivers’ functional decline and avoidable behaviours, assist elderly drivers with their driving activities and increase road safety. Rakotonirainy and Steinhardt  report that new in-vehicle technology could improve safety and comfort as well as maintain elderly people’s mobility for longer. Musselwhite and Haddad  point out that older people are quite willing to accept in-vehicle technology that helps their driving, with a slight preference for those that provide feedback rather than reduce workload.
In-vehicle system capabilities: driver feedback and support
A distinction is made between driver feedback and driver support. Driver feedback offers information (such as location, fuel consumption and the frequency of lane deviation) whereas driver support makes it possible to improve performance based on the information available through feedback (e.g. a better route, how to reduce fuel consumption, how to make fewer lane deviations). Driver support can be in the form of advice, an alert or a warning, or even active intervention. Different IVSs will offer one or more of these capabilities.
In-vehicle navigation systems (IVNS) are common applications using feedback and support. They use a Geographic Information System (GIS), which combines a map and a database, and a satellite navigation system such as Global Positioning System (GPS) . Currently, IVNS typically uses a GPS-enabled device to acquire position data to give feedback by locating the vehicle on the map displayed to the user. Each GPS-enabled device needs to receive signals from at least four satellites to calculate its position in three dimensions, therefore an unobstructed view of the sky is required. This means that signal loss and/or multipath error occurs often in urban canyons or tunnels. A dead reckoning technique (a method of determining position by making an educated guess based on last known position, speed, time and direction), using a gyroscope and an accelerometer is applied to enhance the reliability of IVNS. A system using satellite based, mobile based and wireless technologies was successfully tested in Newcastle during the ASK-IT project (Ambient intelligence system of agents for knowledge-based and integrated services for mobility impaired users, funded by the EU 6th Framework IST programme) to provide both indoor and outdoor location-based services to disabled and elderly people . A future system which integrates GPS with current technologies as well as the forthcoming Galileo system (a European Civil Satellite Navigation system launched by the European Council in 2002) will be able to provide a fully connected and pervasive IVNS.
According to Burns  and Goodman et al. , IVNS have the potential to maintain elderly drivers’ mobility and hence independence and quality of life. For example, they can offer support in the form of advice by providing distance information to identify the location of forthcoming manoeuvres , which creates more time for elderly drivers to prepare for the manoeuvres. They help elderly drivers when they travel in an unfamiliar area, where they are often reluctant to travel [45, 46]. It also allows elderly drivers in the early stages of dementia to locate themselves and guide them back home when they are lost, even in a familiar area . However, a safety concern with IVNS using relatively complex visual displays is raised for elderly drivers by Mourant et al. (2001) and May et al. . Also, an age-related decline in learning environment layout (e.g. route selection, scene recognition, distance ranking and map placement) is identified by Kirasic  and Moffat et al. . Nevertheless, Guo  points out that using snapshots (photographic images) of landmarks for navigation is welcomed by people of all ages. Goodman et al.  discovered that a navigation aid based around landmarks is particularly useful for elderly people. May et al.  report that the incorporation of landmarks in the turn-by-turn instructions provided by a navigation system has improved the confidence of elderly drivers in particular, because it significantly reduced the time spent glancing on the visual display. Therefore, the use of landmarks as navigation cues can increase the effectiveness and safety of navigation systems.
Connections to the vehicle controller area network bus (CANbus) have allowed information relating to speed, distance, time of trip, fuel consumption, electrical accessory usage, and heating and ventilation usage to be gained. This information is then used to provide feedback and support. The existence of sensor technology, radio frequency communication-based technology, ad-hoc communication, positioning technology and video image processing technology enables extra information on the driving environment to be collected and interpreted. Examples of such information are distance and/or speed from the vehicle ahead, lateral position of the vehicle on the lane and degree of visibility (e.g. day or night). Integrating them into in-vehicle driver support systems should decrease human errors, alert the driver as early as possible to an impending danger, warn him/her if there is no driver reaction to the first alert and actively assist or ultimately intervene in order to avert the accident or mitigate its consequences [14, 41, 50, 51]. Warnings should be given in visual or audible formats rather than vibrating format as elderly drivers are less sensitive to vibration .
Driver support systems have the potential to address either directly or indirectly the specific declines in perceptual, cognitive and physical performance by enabling a reduction in driver workload . Nevertheless, it is important to allow elderly drivers to select when and how much support they wish to receive, thereby increasing user acceptance and subsequent willingness—and capability—to improve their driving performance and road safety . A summary of these driver support systems with the potential assistance to elderly drivers is shown in Table 2.
In-vehicle system capabilities: methods of delivering feedback and support
Feedback on and support for driving performance can be delivered either in-vehicle (on a display) before, during and at the end of the trip or off-vehicle (e.g. at home or on a mobile digital device) at the convenience of the driver through, for example, emails, websites, mobile phone text messages or paper-based statements. However, Fairchild et al.  have suggested that, for feedback to be effective, advice to the driver must be timely and useful, enabling the driver to take action that will improve driving performance in one or more ways, e.g. at the point of the negative behaviour being detected, but without causing a driving hazard in safety critical situations; or after the event whilst still in the car so that there is recent memory of the journey; or off-vehicle, so that more detailed feedback and support can be offered in a non-stressful environment. As many elderly drivers are unaware of their decreased driving performance or are less concerned about relevant issues [7, 54], the use of driver feedback systems will provide opportunities for them to recognise their weaknesses and possibly adopt measures to tackle their diminished driving performance.
One example of off-vehicle feedback is Fiat’s eco:Drive system . This measures the driving-style characteristics of the driver which can be downloaded via a universal serial bus (USB) drive. Data are analysed using a Fiat web service when uploaded to the user’s home computer. The user is then presented through their web browser with a summary of feedback information such as journey cost and estimated CO2 emissions, together with support in the form of general tips for better driving.
Foot-LITE is a research project funded by the UK Engineering and Physical Sciences Research Council (EPSRC). It seeks to deliver innovative driver/vehicle interface systems and services to encourage sustained changes to driving styles (to improve safety and eco-driving) and wider travel behaviour (for example switching to non-car modes) . The Foot-LITE system targets drivers from across the socio-economic spectrum and at all levels of experience, making it an appropriate system for use by elderly drivers. The system comprises an in-vehicle device to provide immediate feedback to the driver on a full colour screen that indicates the driving error or risky behaviour that has occurred and provides support showing how it may be corrected and avoided in the future. Further in-vehicle feedback is provided at the end of a trip, indicating journey length, cost (measured by the fuel used) and emissions; it also offers support in the form of ‘lessons to be learned’. Finally, statements sent out through the internet at the users’ preset timing (e.g. weekly or monthly) provide totals of measured driving factors such as fuel consumption, the number of times a driving infringement was committed, for that time period. It also provides a comparison of how the driver is performing in terms of the changes that have been made in driving style and their impact on the cost of driving and vehicle emissions (which could also increase as well as decrease) over a longer period of time which encompasses multiple trips. Lastly, off-vehicle web based support directs the driver to personalised lessons that will show how to improve their driving style. Driver performance is measured against pre-defined driving standards. The Foot-LITE system has undergone simulator trials fully instrumented vehicle trials and a three vehicle prototype trial; the final field trial will be carried out on a thirty vehicle test fleet.
A more advanced method of delivering feedback and support is the head-up display (HUD). This is a transparent display that presents critical and relevant information to the driver without requiring him/her to look away from the road (Fig. 1). A HUD can be used on forward displays, such as a car windshield, or in rear view/wing mirrors. In March 2010, General Motors announced its new concept: an enhanced vision system that builds upon conventional HUD technology and displays important information across the entire windshield using cameras and sensors placed around the car (www.wired.com/autopia/2010/03/gm-next-gen-heads-up-display).
As visual impairment is common in elderly people, displaying road signs, speed limit data and traffic signs on the HUD (with optional audible cues) could improve elderly drivers’ road safety by enhancing the clarity of road/traffic signs . In addition, elderly drivers, who need an early warning, due to a slower reaction time than younger drivers, will have the chance to decide when they want such information to be made available on the HUD. This will give them enough time (usually longer than for younger drivers) to perform the manoeuvres, before they are able to see the actual sign. This is probably a more effective alternative to ‘making road signs bigger to help elderly drivers’, as suggested by Box et al. . Moreover, integrating the HUD into IVS has the potential to allow the driver to remain focused on the environment outside the vehicle while maintaining the situational awareness of the relationship between the vehicle and the external objects by offering the driver advice along with a bird’s eye view of what is around the vehicle and the distances from them. Campbell et al.  suggest that a higher sensitivity setting of the interfaces should be available for elderly people because they have poorer visual acuity and are less sensitive to luminance contrasts.
Use of a driving simulator to evaluate the impact of in-vehicle systems on elderly drivers
The history of driving simulators can be traced back to the 1920s when simulation was first used to evaluate the skill and competence of public transport operators . Since then, driving simulators have been used to investigate the parameters that govern driver choice and behaviour, driver training and evaluation of vehicle design and technologies. It was pointed out by Yang et al.  and Lee et al.  that driving simulators give researchers full control of the situational and environmental variables. Also, Breker et al.  report that simulation makes it possible to conduct tests in new ways that cannot be realised in real traffic environments. This means that they can conduct observation and evaluation of driver performance and behaviour in relation to the impacts of hypothetical road elements or traffic events. This means that they can avoid potentially hazardous on-road driving conditions and accompanying legal restrictions that may be caused by experiments. It is also a cost-effective alternative to on-road driving tests. The main concern regarding research using driving simulators is the validity of the results. In order to bring high fidelity user experience to the study subjects, it is essential to provide the subjects with the same sensory cues that they experience in real world driving. However, this was not possible in the past which led to misinterpretation of the signals between the eye and the inner ear. Elderly subjects often suffered motion sickness and had to terminate the experiment early. Furthermore, an older person’s ability to act in an unfamiliar technological environment might influence driving performance in the simulator as moderating variable . With the development of motion-cueing algorithms, the current generation of driving simulators (often in a form of the front half or all of a car) are supported by the use of a sophisticated and interactive motion-platform. This platform, which is integrated underneath the driving simulator, is able to provide an immediate understanding of the motion of the vehicle in the simulated world and a valid duplication of the real world driving experience.
Driving simulator technology is being applied in the Social inclusion through Digital Economy (SiDE) project. This has been funded by the Research Councils’ UK Digital Economy Programme for 5 years from October 2009. Based at Newcastle University, SiDE will address four fields where digital technologies and the building of a truly inclusive digital economy could deliver major social benefits: Connected Home and Community, Accessibility; Inclusive Transport Services; and Creative Industries.
One of the key studies covered under Inclusive Transport Services is to evaluate whether IVSs underpinned by emerging technologies can assist elderly drivers to drive safely for longer. To understand elderly drivers’ behaviour in response to such IVSs, the SiDE project intends to establish driver awareness of their driving capability—and therefore their vulnerability as road users—which can then be compared with their actual functional ability at a later stage. This is different from the AGILE project which focused on establishing an aetiological classification of ageing-related illnesses associated with driving and accidents and gathering knowledge of driver assessment, driver training and traffic safety.
IVSs will then be tested using a driving simulator (as described above) equipped with a suite of technologies, including in-vehicle sensors (located on the pedals and steering wheel), multiple cameras and projectors, eye tracking and head movement systems and distributed ad-hoc wireless networks. As seen in Section 3, each IVS has a different set of capabilities which will be tested and evaluated individually as well as the whole system. These capabilities will be analysed according to the information that is being delivered (e.g. navigation instructions, lane departure, headway), the reactions made by the subjects (such as braking, accelerating, entering an intersection or high speed traffic) and the degree of personalisation and tolerance of visual load that can be made by the user. After each IVS has been evaluated, there will be a comparative evaluation of all the systems.
Individual driver performance and attitudes to the IVSs will be measured before and after the implementation of each IVS into the driving simulator and its environment. This will permit a sound understanding of the impacts on individual elderly drivers and the scope for adopting these systems. The output of this study will identify the most appropriate combinations of in-vehicle capabilities; the propensity for elderly drivers to adopt these systems; and it will recommend ways of increasing the awareness of elderly drivers about their vulnerability as road users and how it may be overcome using IVSs. The research will also help to identify personalised training needs for individual elderly drivers and to enhance the elderly drivers’ understanding of the other drivers’ driving behaviour and inform the development of new rules and traffic signs.
Elderly drivers are fragile and vulnerable on the road and do not represent an excessive risk or threat to other road users. They are more likely to hurt themselves than to put others at risk. Meanwhile, some of they are more likely to be involved in traffic accidents, be at fault, and are over-represented in traffic fatalities due to age-related functional decline. Also, the ageing population is growing fast worldwide, which is likely to be accompanied by a rise in age related accidents with an inevitable social and monetary cost for society. Neglecting their need for safe driving will lead to a decrease in their quality of life, loss of independence and potentially a high rate of clinical depression.
A review of IVSs suggests that providing feedback and support to elderly drivers has the potential to enhance their safety on the road and benefit the transport network as a whole. Driver feedback offers information on elderly drivers’ driving performance and helps them be aware of the misjudgements or driving errors being made. Driver support provides elderly drivers with timely and constructive advice, alerts, warnings or even active interventions which take over the activity from the driver to avoid accidents or reduce the seriousness of the accidents. Driver feedback and support can be delivered either in-vehicle using head-up displays or off-vehicle using a home computer or other personal mobile devices.
A newly funded research project, Social inclusion through Digital Economy (SiDE) will evaluate the impact of IVSs on elderly drivers’ driving performance to ascertain whether such systems can assist elderly drivers to drive safely for longer. SiDE will establish elderly drivers’ vulnerability as road users based on their awareness of functional decline, and will test a suite of selected IVSs using a driving simulator. It is anticipated that the SiDE project will deliver a sound understanding of the impacts of different systems on elderly drivers, the scope for adopting individual systems or combinations of systems and the individual training needs for safe driving for older drivers. It will also help the elderly drivers’ understanding of the other drivers’ driving behaviour and inform the development of new rules and traffic signs.
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Guo, A.W., Brake, J.F., Edwards, S.J. et al. The application of in-vehicle systems for elderly drivers. Eur. Transp. Res. Rev. 2, 165–174 (2010). https://doi.org/10.1007/s12544-010-0037-y
- Elderly driver
- Vulnerable road user
- Driver feedback
- Driver support
- In-vehicle system