California state route 91 is slated for median reconstruction toprovide high-occupancy vehicle (hov) lanes in the corridor. On the basis of national experience, construction in the median of a highway can cause a 5 to 10% decrease in throughput. Because route 91 is one of the ten most congested corridors in the state, some effort must be made to mitigate this throughput reduction. During the past fewyears, a number of construction traffic management measures have been implemented in southern california and around the country. The success of these isolated attempts at relieving congestion caused by construction activities has spawned the development of traffic management plans (tmps). Local transportation officials requested that these types of measures be evaluated to determine which could be used in this corridor. Because there have been few before-and-after studies to quantify the effectiveness of tmp measures and because of the singular characteristics of the corridor, the background data that was collected had to be subjectively interpreted for its relevance in this evaluation. The purpose of this study is to evaluate possible tmp measures for their applicability to the route 91 corridor, their ability to mitigate construction impacts, and their cost-effectiveness of implementation during hov lane construction. Also considered were the benefits derived from the interdependent nature of many of the measures and their relative advantages and disadvantages. This paper appears in transportation research record no. 1299, Hov facilities AND TRANSPORTATION SYSTEMS MANAGEMENT 1991 .
Abstract