Daylight Conspicuity of Reversible-Lane Signal Systems

Abstract

This investigation compared the conspicuity of two traffic signal-light systems for improving the use of peak-hour reversible and dual-use two-way left-turn lanes. The systems considered were the conventional lane-use control signals and a new system of revolving beacons. Six drivers were asked to identify various characteristics of the signals at two distances (91 and 244 m) and three viewing angles (0, 0.9, and 0.17 rad), which approximated a motorist's view from different positions on a five-lane street. At 0 rad, detection and recognition of both signal-light systems was quite good. However, at more extreme viewing angles, the revolving beacon system was detected and recognized more often. It was concluded that the revolving beacon system would be more conspicuous to a driver attempting to enter the reversible lane.

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