The National Academies

NCHRP 17-07 [Final]

Guidelines for Converting STOP to YIELD Control at Intersections

  Project Data
Funds: $200,000
Research Agency: Bellomo-McGee, Inc.
Principal Investigator: Dr. Hugh W. McGee
Effective Date: 11/16/1985
Completion Date: 5/15/1989

Recent research indicates there could be large savings in fuel consumption, vehicle operating costs, motorist delay, and vehicle emissions if YIELD control were substituted for STOP control at appropriate locations. These user savings may offset increased accident costs, if there are more accidents, where intersections are converted from STOP to YIELD control. This potential for cost savings and improved operations sets the stage for possible large-scale conversions of many STOP-controlled intersections to YIELD control.

Studies of low-volume intersections have concluded that control type has no appreciable effect on accident experience. These studies indicate YIELD control is more economical than STOP control because of the reduced delay and road user costs. For higher traffic volume intersections, however, insufficient accident data have been collected to demonstrate the relative safety of STOP versus YIELD control. The objectives of this research were (1) to determine the accident experience when STOP-controlled intersections are converted to YIELD control, and (2) to develop guidelines for converting STOP control to YIELD control.

The research involved (1) review of current traffic engineering practice and safety experience at Stop and Yield controlled intersections, (2) gathering of accident data for intersections with varying levels of traffic and features, (3) analysis of the safety experience by intersection type and traffic characteristics, (4) evaluation of user cost differences between STOP and YIELD controlled intersections, and (5) development of guidelines for the conversion of intersection control.

Status: The research has been completed, and the final report has been published as NCHRP Report 320, "Guidelines for Converting STOP to YIELD Control at Intersections."

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