PROCEDURAL GUIDE FOR LEFT-TURN ANALYSIS

Procedures for calculating intersection left-turn capacities and determining left-turn bay and protected phase requirements were developed in Report 258-1 of Study 3-18-80-258, "Guidelines for Left-Turn Treatments." In addition, Report 258-2 developed guidelines for choosing left-turn phase sequence patterns. The procedures and guidelines from the two reports are synthesized and presented in a stepwise format. A series of example problems is included to illustrate the procedures and facilitate usage. (Author)