 Original Paper
 Open access
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An improved approach for association rule mining using a multicriteria decision support system: a case study in road safety
European Transport Research Review volume 9, Article number: 40 (2017)
Abstract
Purpose
Road accidents have come to be considered a major public health problem worldwide. The aim of many studies is therefore to identify the main factors contributing to the severity of crashes.
Methods
This paper examines a largescale data mining technique known as association rule mining, which can predict future accidents in advance and allow drivers to avoid the dangers. However, this technique produces a very large number of decision rules, preventing decision makers from making their own selection of the most relevant rules. In this context, the integration of a multicriteria decision analysis approach would be particularly useful for decision makers affected by the redundancy of the extracted rules.
Conclusion
An analysis of road accidents in the province of Marrakech (Morocco) between 2004 and 2014 shows that the proposed approach serves this purpose; it may provide meaningful information that could help in developing suitable prevention policies to improve road safety.
1 Introduction
Data mining is defined as a nontrivial process of identifying valid, novel, potentially useful and ultimately understandable patterns in data [1]. Indeed, it is a vital part of business analytics and the most important trends in information technology. It involves many common classes of tasks (clustering, classification, association rules [2] etc.) which are designed for knowledge discovery in databases (KDD).
Data mining techniques are widely used in several research domains and have provided useful results to guide decision makers. Many researchers [3,4,5,6,7] have studied the application of data mining techniques in the domain of road accidents through association rules mining. The association rule is a powerful data mining technique for discovering a correlation between variables in the database. It is based on statistical analysis and artificial intelligence. This technique is particularly appropriate for studying road accident data by considering conditional interactions between input datasets, extracting frequent itemsets and then generating the association rules by satisfying certain parameters such as the minimum support and the minimum confidence. In this paper, the goal of the proposed approach is not to optimize road safety, but to generate insights and sufficient knowledge to enable decision makers to make the right optimization decision to avoid dangerous routes and improve road safety. This approach consists of two major steps; a rules generator using the Apriori algorithm to extract association rules, and multicriteria decision analysis to evaluate and select the interesting rules from the large set extracted.
The rest of the paper is organized as follows: Section 2 describes the related work of data mining and machine learning techniques for accident analysis, while Section 3 describes the proposed methodology for extracting association rules and the integration of multicriteria decision analysis approach within the KDD process. Section 4 presents the results and a discussion of these. In the last section, we conclude by summarizing the work done in the study and describe the contributions of this work.
2 Related work
According to the World Health Organization (WHO) [8], 1.24 million people die each year on the world’s roads, and as many as 50 million are injured. In addition, the Centers for Disease Control and Prevention (CDCP) have announced that road accidents cost 100 billion in medical care every year. Furthermore, the Ministry of Equipment, Transport and Logistics of Morocco [9] gives the statistics of road accidents between 2004 and 2014, as shown in Table 1. Road accidents involve not only loss of human life but also property damage.
As a review of the literature shows, many data mining techniques have been proposed to analyze road accidents. In this context, Kuhnert et al. used CART and MARS to analyze an epidemiological casecontrol study of injuries resulting from motor vehicle accidents. They also identified potential areas of risk, largely caused by the driver situation [10]. Ossenbruggen et al. [3] used logistic regression models to analyze the factors involved in accidents, and found that shopping areas were more dangerous than village sites. Sohn et al. [11] used the three data mining techniques of decision trees, neural networks and logistic regression to discover significant factors affecting the severity of Korean road traffic. Subsequently, Mio et al. [12] used a decision tree to analyze the severity of traffic accidents. They found that fatal injury was caused by many factors, among them seat belts, alcohol, and lighting conditions.
Chang and Wong [13] developed a CART model to analyze the relationship between drivers, severity of injury and the highway environment. Sze and Wong [14] used binary logistic regression and logistic regression diagnostics to control for the influences of demographics and the road environment. In addition, Abugessaisa [15] used clustering and classification trees to carry out interactive explorations based on brushing and linking methods in order to detect and recognize interesting patterns. Moreover, Wong and Chang [16] used several methodologies to discover factors involved in the severity of accidents, and found that a dangerous accident was caused by a combination of different factors. Anderson [17] studied the spatial patterns of road accident injury and used the resultant patterns to create a classification system for road accident hotspots. Zelalem [18] studied driver responsibility using the ID3, J48, and multilayer perceptron (MLP) algorithms to discover the related factors, and found that many factors have a direct impact on the severity of accidents, such as license grades and the driver’s age and experience. Pakgohar et al. [19] used CART and multinomial logistic regression (MLR) to explore the roles played by the characteristics of drivers, and found that the CART method provided relatively precise results. Demirel et al. [20] used remote sensing for regional scale analysis and effective management of environmental factors. They concluded that this technology could be useful in the prevention of some type of accidents. Wu et al. [21] used the global positioning system (GPS) in the prevention of collision accidents. Zhang et al. [22] concluded that the lack of use of seat belts and inadequate training were also two important factors. Sanmiquel [5] analyzed the main causes of accidents using Bayesian classifiers and a decision tree.
Other association rule mining algorithms have been widely used in the literature to extract frequent itemsets and build decision rules. These algorithms are based primarily on minimum support and the minimum confidence. However, most of them produce a large number of results, which prevents decision makers from making their own selection of the most relevant ones. It is therefore important to propose an approach that can help decision makers to make their choice. Multicriteria decision analysis (MCDA) offers a powerful solution; its advantages include taking into account the decision makers’ preferences and a diversity of criteria. This paper proposes an approach to association rule miningbased MCDA for analyzing road accident data.
3 Proposed methodology
In this section, we discuss the various steps used in the construction of our proposed methodology. We start by developing the association rule mining, as described below.
3.1 Association rule mining
The association rules technique is a powerful data mining method for discovering the relationship between variables in large databases. It was proposed by Agrawal [2] for analyzing transactional databases. It is defined as follows: let I = {i _{ 1 } ,i _{ 2 } …i _{ n } } denote the set of n binary items, and let D = {t _{ 1 } ,t _{ 2 } …t _{ m } } denote the set of transactions. Each transaction in D has a unique Id and contains a subset of items in I. The details are given in Table 2.
An association rule is defined as an implication of the form A → B such that A , B ⊂ I and A ∩ B = ϕ. Each rule is composed of two different sets of items, A and B, where A is called the antecedent and B the consequent. To extract association rules, two measures are required: the support and the confidence. The support is defined as the proportion of transactions in the database which contain the items A. The formal definition is (1):
The confidence determines how frequently items in B appear in a transaction that contains A. The formal definition is (2):
An initial step towards improving association rules algorithms is to decompose the problem into two main steps. The first is to find all itemsets that satisfy the minimum support; this step is generally expensive, due to the requirement for multiple passes over the database (see Fig. 1).
The second step is the generation of association rules. This step is responsible for extracting all highconfidence rules from the frequent itemsets found in the previous step. The association rules technique has led to significant gains in other areas and can also be used to improve the transportation sector.
3.2 Multicriterion decision analysis
Keeney and Raiffa’s [23] seminal book on MCDA defines this as “an extension of decision theory that covers any decision with multiple objectives. A methodology for appraising alternatives on the individual, often conflicting, criteria, and combining them into one overall appraisal”. Roy [24] distinguishes three types of problematic: choice, sorting and ranking (see Fig. 2). Due to the large number of extracted association rules, we are interested in the multicriteria sorting problematic, using an existing method called ELECTRE TRI [25].
3.2.1 ELECTRE TRI
ELECTRE TRI is a multicriteria sorting method that assigns alternatives to predefined categories. Each category must be characterized by a lower and upper profile. The details are given in Fig. 3.
In the data mining field, the association rule algorithms produce Pγ,a large number of extracted rules that do not allow an expert to make their own selection of the most interesting. To deal with this problem, the integration of MCDA, and particularly the existing method known as ELECTRE TRI, offers the ability to sort the results [26,27,28,29].
Let A= A = {a_{1}, a_{2}, a_{3}, … , a_{m}}{a _{ 1 } , a _{ 2 } , a _{ 3, } …,a _{ m } } denote the set of alternatives, C=A = {a_{1}, a_{2}, a_{3}, … , a_{m}}{C _{ 1 } , C _{ 2 } , C _{ 3, } …,C _{ h } } the set of categories, and B=A = {a_{1}, a_{2}, a_{3}, … , a_{m}}{b _{ 1 } , b _{ 2 } , b _{ 3, } …,b _{ h } } the set of profiles. The alternatives are compared, not with each other, but with thresholds reflecting the boundary between h categories. ELECTRE TRI assigns alternatives to categories using two consecutive steps:

Step 1:
Construct an outranking relation S by validating the assertion aSb _{ h }, whose meaning is “a is at least as good as b _{ h }”, and build the degree of credibility σ(a, b _{ h }). The assertion aSb _{ h } is considered to be valid if σ(a, b _{ h }) ≻ λ, λ being a “cutting level” such that λ ∈ [0.5, 1].
Determination of the outranking relation consists of the following steps:
Computation of the partial concordance indices c _{ j } (a,b _{ h } ):
Computation of the concordance index c(a,b _{ h } ):
Computation of the discordance indices d _{ j } (a,b _{ k } ):
Computation of the credibility index σ(a, b _{ h }):
where:
 K _{ j } :

is the weight of criteria j
 C _{ j } (a,b _{ h } ) :

is the partial concordance index of criteria j
 F :

= {j∈ F:d _{ j } (a,b _{ h } ) > C(a,b _{ h } )}
The outranking relation is defined based on the index of credibility σ(a,bh) and λcut indices as follows:

σ(a,bh) ≥ λandσ(bh,a) ≥ λ ⇒ aSbhand σ(b _{ h }, a) ≥ λ → aSb _{ h } and bhSa ⇒ aIbh, a is indifferent to b _{ h. } .

σ(a,bh) ≥ λandσ(bh,a) < λ ⇒ aSbh σ(a, b _{ h }) < λ and σ(b _{ h }, a) ≥ λ → a does not outrank bh and b _{ h }Sa →bh outranks a.

σ(a,bh) < λandσ(bh,a) < λ ⇒ a does not outrank bhandbhand b _{ h } does not outrank aa; in this case, a and b are incomparable.
The values of σ(a, b _{ h }) and λ determine the preference between the alternative a and the profile b _{ h }. The alternatives are not compared with each other, but with thresholds reflecting boundaries between h categories. Three situations are then possible: aIb _{ h } indifferent, aRb _{ h } incomparable, and aSb _{ h } outranking.

Step 2:
Assignment Procedures
Two assignment procedures, pessimistic and optimistic are then available.
Pessimistic assignment: compare the alternative a successively to b _{ i } for i = h,h1,..,0, then assign a to the category c _{ h + 1}(a → c _{ h + 1}).
Optimistic assignment: compare the alternative a successively to b _{ i } for i = 1…h. then assign a to the category c _{ h }(a → c _{ h }).
3.3 Proposed approach
Road accident analysis can be conducted using three different categories of methods: analytical methods, statistical methods, and simulation. Each method has certain strengths and weaknesses. Generally, simulation methods require sophisticated resources, making them timeconsuming. Analytical methods are fast to apply but cannot be used in complex problems. Due to the weakness of these methods, statistical methods are best suited to our goal of understanding complex road accidents. However, traditional statistical methods do not offer a high level of automation when it comes to analyzing large data.
Data mining is often used as an approach which integrates concepts from statistics and artificial intelligence. Hence, it is a powerful tool that can discover complex and hidden relationships in large datasets. It has a clear advantage over other traditional statistical methods, particularly in the case of complex systems; this is certainly the case in the current study of road safety optimization.
To construct an adequate model for discovering interesting rules from an accidents database, it is important to integrate decisionmaking methods into the association rule mining process, in order to improve the quality of the extracted rules and build a performance model for road accident analysis.
The proposed approach is divided into two modules. The first is the association rules generator for extracting rules using the Apriori algorithm. The second is the decision support module for measuring the accuracy and relevance of results, as well as helping the expert to make the right decision concerning road network planning and new policies for road safety etc. The details of the proposed approach are shown in Fig. 4.
The global process of the proposed approach is presented in Fig. 5, wherein three steps are required. Firstly, preprocessing of the data is carried out, for which we use an extract transform load (ETL) tool to prepare and cleanse the data. Secondly, the correlations between variables in the data are extracted using the association rules technique, and the results are sorted according to the decision makers’ preferences using the ELECTRE TRI method. Finally, the results are visualized using the arulesViz [30] package in R.
3.3.1 Variables setup
The accident data were obtained from the Ministry of Equipment, Transport and Logistics [9] in the province of Marrakech (Morocco) for the period 2003–2014. Each road accident has a record in the police database; this consists of various important attributes of the road accident. We select a set of records as the input for the algorithm. In order to identify the main factors that affect road accidents, 21 variables were used (see Table 3) [31]. These variables describe characteristics of the accident (type of collision, road users, injuries etc.), traffic conditions (maximum speed, priority regulations etc.), environmental conditions (weather, light conditions etc.), road conditions (road surface, obstacles etc.), human conditions (fatigue, alcohol etc.), and geographical conditions (location, physical characteristics etc.). The data model used is given in Fig. 6; this contains the data records related to the road accidents. In the first step, the algorithm takes as input the accident dataset, the minimum support and the minimum confidence for mining the association rules.
In the second step, MCDA is used to evaluate the extracted rules according to the decision makers’ preferences in order to reduce the large number of rules, and shows only the most relevant. An analysis of this information can produce good results that can help decision makers to understand the factors behind road accidents; hence, appropriate preventive efforts can be undertaken.
3.4 Implementation
The new contribution of this work is the application of these techniques to general business problems using computerized approaches with graphical interfaces, meaning that the tools are easy to use and available to business experts. The technical architecture of the proposed approach is given in Fig. 7. The implementation is based on R [32] and Shiny [33], the opensource programming language and software environment for statistical computing and graphics. The server is composed of two components: the Rstudio Server and R packages for association rule mining and visualization. Shiny is an R package that makes it easy to build interactive web applications directly using R. The individual components are clients; these are connected to a network and send a request to the server, and the server responds accordingly. The web application is interactive, scalable and suitable for road accident analysis.
4 Results and discussion
Following data cleansing, we select a set of significant records which identify the factors related to road accidents. Then, we apply the proposed approach using two steps. The first is the extraction of association rules from datasets using the Apriori algorithm with the minimum support = 0.33 to extract frequent itemsets (see Fig. 8). This figure illustrates the itemsets by frequency. The results are sensitive to the minimum support introduced in the first step of Apriori algorithm. The second step is to generate the association rules from the frequent itemsets previously extracted. The extracted rules are given in Table 4.
To visualize the extracted rules, we use arulesViz [30] as an R package extension; this implements several known and novel visualization techniques such as matrix, group, and graphbased visualization. The frequent itemsets are shown in Fig. 8. The matrixbased visualization technique presents the antecedent and consequent items on the X and Y axes. This technique is enhanced using a grouped matrix, by grouping the extracted rules using clustering; an example of a grouped matrixbased visualization is given in Fig. 9. The group of the most interesting rules according to the lift (this measures how far the antecedent and consequent rules are from independence) are shown in the top lefthand corner of the plot. There is one rule which contains “Driver_sex = M”, and two other items in the antecedent (LHS); the consequent (RHS) is “Accident_type = Fatal”.
Graphbased visualization uses vertices and edges (see Fig. 10). The vertices typically represent items or itemsets, and edges indicate a relationship between rules. Interesting measures are typically added to the plot as labels for the edges.
The Apriori algorithm and its derivatives provide an effective solution for the extraction of association rules. However, these algorithms produce a large number of rules, preventing decision makers from making their own selection of the most interesting rules. To solve this problem, the integration of multicriteria decision analysis approach is useful in practice for decision makers affected by redundancy in the extracted rules [29,30,31]. In this context, we use the ELECTRE TRI method, considering a set of extracted rules as the alternatives and support, confidence and lift as the criteria.
The support used in the first step is to count frequent itemsets using the Apriori algorithm, which satisfies the minimum support requirements defined by the user. This step is generally expensive due to the use of multiple passes over the database. For the second step, after the extraction of association rules in the form of A → B, the support, confidence, and lift of each extracted rule is computed using the Apriori algorithm. We use multicriteria decision support to prioritize the extracted rules; each method in MCDS is based on the decision matrix (evaluation table), where the values of this table are given by the decision makers (domain expert) according to their preferences. In this case, we used minimum support = 0.33 to count frequent itemsets, and for the MCDS we used the values computed by the algorithm as the preference of decision makers in order to determine the performance of our approach.
Table 5 gives the decision matrix (evaluation table), which lists the rules as rows of the table and the criteria as columns. Then, each rule/criteria combination is scored, with a weight determined by the relative importance of the criteria, and these scores are added to give an overall score for each option. The scores for support and confidence vary between 0 and 1.
Decision matrix analysis is a useful technique for making a decision. It is particularly powerful where there are a number of good alternatives to choose from and many different factors to take into account. Decision matrix analysis helps in deciding between several options where many different criteria are involved.
The second step of ELECTRE TRI is to define a set of profiles according to the decision makers’ preferences; the profiles b _{ 1 } and b _{ 2 } are the limits between categories A and B and categories B and C (see Table 6).
Each alternative is compared to the profiles; the importance of each criterion in decision making is reflected in predefined threshold scores. The preference threshold p, the indifference q, and the veto threshold v are given in Table 7. Moreover, each criterion has a weight k, reflecting its contribution to the final decision.
The third step is the computation of the concordance indexes c _{ j } (a,b _{ h } ) as in Eq. (3) and the discordance indexes d _{ j } (a,b _{ k } ) as in Eq. (5). The results are the outranking relations, which determine the relationship between the rules and profiles. The parameter that determines the preferred situation between the association rules and the profiles b _{ h } is known as the cutting level, and its default value is λ = 0.76. The evaluation of the association rules using assignment procedures is shown in Table 8.
4.1 Discussion
Road safety is currently one of the government’s highest priorities. Identifying and profiling black spots and black zones in terms of accidentrelated data and location characteristics needs to provide new insights into the complexity and causes of road accidents, which, in turn, provide valuable input for government actions. Data mining techniques have led to significant advances in other areas and should also be used to improve this sector. The use of inventory management systems tracking sensors generates a large amount of data; this appears to be a possible application area for data mining, and there have been prior studies of analyzing, optimizing and improving road safety in shipping and transport logistics. The existing method of optimization has long been computerized, but does not provide the type of insights that are the goal of data mining. The goal of our proposed approach is not to optimize transportation safety, but to generate insights and sufficient knowledge to enable logistics managers to make the right decision, thus enabling the optimization, the avoidance of dangerous routes and improvements in road safety.
In this study, Table 8 shows the results of assigning rules to categories (classes) C1, C2, and C3 such that the most relevant category is C1. The extracted decision rules indicate that fatal and injurycausing accidents occur mostly in the following situations.

The first most common cause of accidents is speeding. Speed influences both the risk of a crash and its consequences;

Females have a direct impact on the accidents;

Most accidents occur when lighting exists.

The number of deaths and injuries is increasing, especially in summer.

Accidents frequently occur when the weather is clear.
Based on this study, it can be said that the integration of multicriteria decision analysis within knowledge discovery in databases performs well and produces useful knowledge. After eliminating the noninteresting rules, 32 significant rules were obtained. The rest of the rules belong to the less interesting categories interest. The most interesting rules are given in Table 9.
The use of the Apriori algorithm and its derivatives produces a large number of association rules. It is therefore difficult to extract useful insight from this wide range of results. However, the integration of multicriteria decision analysis approach within the association rules process selects only the most relevant rules, according to the decision makers’ preferences. The results are always sensitive to the values of thresholds p _{ j } , q _{ j } , v _{ j } , and the decision makers’ preferences.
There is a rich literature that describes the different techniques and their outcomes in road accident analysis [4, 6, 15, 23, 34, 35]. These techniques have found an association between drivers’ behaviors, weather conditions, light conditions and the severity of accidents. However, the large size of the database leads to a very high number of extracted rules, which cannot be explored further, and which confuse decision makers. The results of our study not only confirm an association between certain variables but also show that the integration of MCDA allows decision makers to make their own selection of the most interesting rules, according to their preferences and needs, allowing the application of accident prevention efforts in the identified areas for various categories of accidents.
In summary, the integration of the association rules technique within multicriteria decision analysis contributes to a better understanding of the dynamics of road accidents and can provide meaningful information to help decision makers and logistics managers to improve performance in terms of transport quality and road safety optimization. Finally, the proposed approach has the following major strengths:

Mining and visualization of association rules

Management of the interest level of association rules

Reduction of the large number of extracted rules.

Road accident analysis

Improvements in road safety
5 Conclusion
In many countries, road transport often involves accidents, and this affects transport and shipping services. Understanding road traffic is extremely important in improving road safety. In this paper, we propose an effective method for mining strong and relevant association rules from a road accident database. With the objective of identifying the hidden relationships between the most common accidents, the road accident dataset is analyzed using the association rules technique. The proposed method uses efficient mining of association rules. Furthermore, the integration of MCDA within the association rule mining process provides a sustainable solution by selecting only the most interesting rules according to the decision makers’ preferences. In particular, we study a set of rules extracted from the road accidents database, considering the criteria most commonly used in the literature. We conclude that the application of multicriteria decision analysis to a set of extracted rules can contribute to solving the problem that arises when using traditional algorithms, in terms of redundancy and a lack of interesting rules. Furthermore, the results indicate that human and behavioral characteristics play an important role in the occurrence of all traffic accidents. Finally, the results show that the proposed approach serves its purpose and can provide meaningful information which can help in developing suitable prevention policies for improving road safety.
In further work, a new methodology combining this approach with other optimization methods will be applied in the context of big data, using VANETs, Apache Kafka for streaming, and machine learning to build a predictive model for road safety.
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The authors would like to thank Christine Miles for her english editing. The authors would also like to acknowledge the valuable comments from the referees on our manuscript.
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AitMlouk, A., Gharnati, F. & Agouti, T. An improved approach for association rule mining using a multicriteria decision support system: a case study in road safety. Eur. Transp. Res. Rev. 9, 40 (2017). https://doi.org/10.1007/s1254401702575
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DOI: https://doi.org/10.1007/s1254401702575