00730209

Component

https://doi.org/10.1177/0361198196152300108

https://scholar.google.co...cCoy&publication_year=1996

The objective of the research described here was to study the effects of the offset between opposing left-turn lanes on the turning performance of drivers with respect to driver age and gender. Left-turn performance of 100 subjects within three age groups (25-45, 65-74, and 75+ years old) was evaluated under normal driving conditions at four intersections of different left-turn offset configurations. The results indicate that driver performance can be adversely affected by offsets that are much less (i.e., more negative) than the negative 0.9-m offset. Such large negative offsets significantly increase the size of the critical gaps of drivers turning left and also seem to increase the likelihood of conflicts between left turns and opposing through traffic. Large negative offsets may be particularly troublesome for older drivers and women drivers, who are less likely to position their vehicles within the intersection to see beyond vehicles in the opposing left-turn lane. Surprisingly, driver perceptions of the level of comfort and degree of difficulty were not found to improve with the increased sight distance provided by larger (i.e., more positive) offsets. The 1.8-m positive offset was associated with a lower level of comfort and a higher degree of difficulty perceived by drivers making left turns than the 0.9-m negative offset, which provided less sight distance. This may have been because the 0.9-m negative offset is much more common than the 1.8-m positive offset.

This paper appears in Transportation Research Record No. 1523, Geometric and Other General Design Issues.

English

p. 61-72

1996

Transportation Research Record

0309062217

Figures (3) ; References (1) ; Tables (8)

Age; Comfort; Driver performance; Drivers; Gender; Left turn lanes; Offsets (Traffic signal timing); Opposing traffic; Personnel performance; Sight distance

Driver age

Design; Highways; Planning and Forecasting; Safety and Human Factors; Society; I21: Planning of Transport Infrastructure

TRIS, TRB

Dec 11 1997 12:00AM

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