Left Turn Treatments at Signalized Intersections Without Turn Slots

摘要

Guidelines were developed for left turn provisions at signalized intersections with mixed traffic lanes. They consist of: (1) a general left turn provision guideline which determines, on the basis of delay, if a left turn provision should be considered for the intersection approach under study, and (2) a set of guidelines which determine the type of left turn provision to be used. These guidelines were tested using the results of a series of before and after field studies conducted at intersections where a left turn provision was installed. The results of this testing, along with a procedure for proper application of the guidelines, are included.