Assisting the older driver - SWOV

Effects of intersection design on workload and driving performance
reaction times than 4‐way intersections with dual carriageways (p = 0.00001
and p = 0.02 respectively).
Intersection layout also had a large influence on variation in fraction missed
(η 2 = 0.321), but the influence of intersection sight distance was slightly
higher (η 2 = 0.337). As regards intersection layout, left‐side 3‐way
intersections also led to significantly lower fractions missed than
roundabouts (p = 0.006), T‐junctions (p = 0.0003) and 4‐way intersections (p <
0.000001 for intersections with dual carriageways and p = 0.00002 for regular
4‐way intersections). Right‐side 3‐way intersections, roundabouts and T‐
junctions led to significantly lower fractions missed than 4‐way intersections
with dual carriageways (p = 0.0004, p = 0.000001, and p = 0.03). As regards
intersection sight distance, intersections at which participants had normal
view of cross traffic led to significantly higher fractions missed than
intersections on which participants’ view of cross traffic was restricted (p =
0.0001).
Interaction effects of functional age and intersection characteristics were not
significant. Trends in reaction time and fraction missed were the same for all
age groups (see Figure 6.3).
Fraction missed; Reaction time (s)
2
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2
0
L3‐way R3‐way Roundab. T‐Junction 4‐way dual
carriageway
4‐way
regular
RT_old
RT_middle
RT_young
FM_old
FM_middle
FM_young
Figure 6.3. Reaction time and fraction missed per age group and intersection layout.
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