Assisting the older driver - SWOV

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Effects of intersection design on workload and driving performance dual carriageways. As a result, they drove along to the second street at their left‐hand side. Figure 6.7. Examples of intersections which led to route‐errors. 127
Assisting the older driver 6.4. Discussion and conclusions The aim of this study was to identify those intersection characteristics that have the largest impact on the difficulty of passing intersections, as indicated by driver workload and safety of driver decisions. A distinction was made between the performance of functionally young and functionally older drivers. The latter group of drivers was expected to have more difficulties passing complex intersections than the younger group. The complexity of an intersection was expected to increase with the number of streets and lanes it connects, and to be dependent on the type of priority regulation and the participants’ view of the intersection. 6.4.1. Intersection characteristics The results of this study showed that intersection layout, priority regulation, as well as driver manoeuvres influenced the difficulty of passing intersections. Intersection layout was the best predictor of variations in workload. Three‐way intersections that only had a side‐street at the left‐hand side of the driver turned out to be the easiest intersections to pass, whereas four‐way intersections with dual carriageways were the most difficult to manage. The abovementioned characteristics had the same effect on the workload of functionally young and functionally old participants. Functionally old participants had longer reaction times than functionally young participants, and an increase in the complexity of the intersections to pass led to longer reaction times for both functionally old and functionally young drivers. However, the difference between the reaction times of these age groups stayed the same (see Section 6.4.2). The participants’ view of the intersection did not affect workload as indicated by reaction times on a secondary task. However, this intersection characteristic did affect another indicator of secondary task performance, fraction missed. If buildings or trees obstructed the drivers’ view of the intersection, drivers reacted to more stimuli than when their view of the intersection was not restricted. This may indicate that it is more difficult to pass intersections of which drivers have a good view while approaching it than it is to pass intersections at which buildings and/or trees obstruct the drivers’ view of the intersection. However, as the participants’ view of the intersection only affected fraction missed and not reaction time, the higher fractions missed which were found for intersections that were better visible may also have been the result of a larger amount of visual information. Having the opportunity to also look at cars and signs that are situated at the 128
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SWOV‐Dissertatiereeks, Leidschend
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Promotor: Copromotor: Beoordelingsc
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3.2.3. Conclusions regarding future
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7.3. Preconditions for safe use of
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General introduction General introd
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Physical and mental characteristics
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Strategies to improve the older dri
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Effects of a driver support system
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Assisting the older driver Appendix
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Samenvatting Samenvatting Dit proef
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Samenvatting Verkeersveiligheidsmaa
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Samenvatting jongere automobilisten
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Samenvatting voordeel dat ze de rij
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Dankwoord Dankwoord Het schrijven v
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Curriculum Vitae Curriculum Vitae R
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Assisting the older driver Nottingh
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