United States Department of Transportation
i
Accelerating Roundabout Implementation in the United States - Volume VII of VII: Human Factor Assessment of Traffic Control Device Effectiveness
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2015-09-01
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[PDF-4.64 MB]
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Abstract:This volume is seventh in a series of seven. The other volumes in the series are: Volume I - Evaluation of Rectangular Rapid-Flashing Beacons (RRFB) at Multilane Roundabouts, Volume II – Assessment of Roundabout Capacity Models for the Highway Capacity Manual, Volume III – Assessment of the Environmental Characteristics of Roundabouts, Volume IV – A Review of Fatal and Severe Injury Crashes at Roundabouts, Volume V – Evaluation of Geometric Parameters that Affect Truck Maneuvering and Stability, and Volume VI – Investigation of Crosswalk Design and Driver Behaviors. These reports document a Federal Highway Administration (FHWA) project to investigate and evaluate several important aspects of roundabout design and operation for the purpose of providing practitioners with better information, leading to more widespread and routine implementation of higher quality roundabouts. This report examined the relationship between signing and marking of multilane roundabouts and the likelihood of erratic maneuvers, and thus conflicts and crashes. The report documents two different studies: (1) observation of erratic maneuvers and conflicts from overhead video recordings; and (2) an in-vehicle eye tracker study to investigate driver gaze patterns and gaze direction while traversing multilane roundabouts. The two most dominant contributing factors to erratic maneuvers appear to be (1) inconsistencies between lane use markings on the approach and those within the circulatory roadway, and (2) insufficient channelization for drivers when being shifted from the inside lane to the outside lane to exit. Drivers also were more likely to glance at markings than at signs.
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