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Table 2 Limit values of a monotonous route design
From: Preventing the risks of monotony related fatigue while driving through gamification
| Â | Category | Characteristic | Researched limit |
|---|---|---|---|
TRACK | Track layout | Length of straight sections | 4 km - ∞ |
Number of curves | 0–20 pro 100 km | ||
Length of curves | 1 km - ∞, but always smaller than the curve radius | ||
Radius of curves | 1 km - ∞, but always at least as large as the curve length | ||
Vertical track routing | Perfectly flat | ||
Track type | Track type | Country road, similar to a motorway or motorway | |
Number of lanes in own driving direction | (1 -) 2 | ||
Connections | Junctions | Spacing 25–50 km | |
Parking spaces | Not allowed | ||
Bridges | In combination with each junction and another after every second junction | ||
Markings & Buildings | Frequency of sign appearances | 6 km - ∞ | |
Type of signs | No sign gantry; Typical motorway signs on the roadside | ||
Road marking | Standard marking with dashed and solid white lines | ||
Emergency lane | Continuous right, 2.5 m wide | ||
Median crash barrier | Continuous with guard rail, reflector post, bushes | ||
Reflector post | Continuous on both sides, standard distance 50 m | ||
Crash barriers | Left continuous; Right optionally with constant length of 4 km - ∞ | ||
LANDSCAPE | Topography | / | Plain landscape with horizon limitation |
Meteorology | Weather | No rainfall; Sky blue – cloudy | |
Daytime | Dawn or dusk | ||
Visibility | 2000 m | ||
Season | Summer or summer-like | ||
Type of landscape | Tree density | Low to moderate; Accurate or randomly placed. | |
Urban landscape | Not exclusively; Distance between distant houses or villages in rural area: 6 km - ∞ | ||
Rural fields | Allowed | ||
Water bodies | Not allowed | ||
Change frequency of landscape types (per street side) | Rural: 25 km - ∞; Forest: 10 km - ∞; Noise control: 10 km | ||
TRAFFIC | Traffic participants | Cars | Allowed |
Trucks | Use on half the slower vehicles | ||
Pedestrians | Not allowed | ||
Traffic density | Faster vehicles: density | 0–10 vehicles per hour; In combination with slower vehicles: 0–6 vehicles per hour | |
Faster vehicles: relative velocity & behaviour | Unobtrusive behaviour; Up to 20 km/h above the permitted speed limit, but strictly different from 0 km/h | ||
Slower vehicles: density | 0–10 vehicles per hour; In combination with slower vehicles: 0–6 vehicles per hour | ||
Slower vehicles: relative velocity & behaviour | Unobtrusive behaviour; Up to 20 km/h slower than the test person’s vehicle, but different from 0 km/h | ||
Oncoming traffic | 0–20 vehicles per hour |