High occupancy vehicle treatments, impacts, and parameters (A synthesis). Volume I : Procedures and conclusions. Volume II: Bibliography and data. Final Report.

This two volume report details the findings of 256 past and present high occupancy vehicle treatments which have been implemen- ted. Volume I contains the procedures follow- ed and the major conclusions found concerning the 19 specific HOV treatment types which were studied. Some of these conclusions are that only five treatments (park- n- ride lots separate roadways, contraflow freeway and arterial lanes, and preferential bypass at a metered ramp) produced the impacts which were expected. Volume II contains a comprehensive bibliography along with a listing for each HOV treatment cited which includes the year implemented, size, priority cutoff, hours of operation, current status and any before and after data concerning the impacts which the treatments may have.