Efficacy of Traffic Signal Indicators

Abstract

Surveys were conducted to determine if there is a problem with motorists determining the direction indicated by traffic light signal arrows. Canadian optometrists were asked if their patients report this problem during a visual examination. Drivers were queried about difficulty with the arrows and under what circumstances the difficulties occurred. Traffic engi­neers were requested to comment on the use of traffic light arrows in their jurisdictions and whether or not they perceive a problem with visibility. The results indicate that many Canadians, and Manitobans in particular, reported difficulty with the arrows.