APPLICATION OF VIDEO IMAGE DETECTION AT SIGNALIZED INTERSECTIONS DURING RECONSTRUCTION

An increasing number of signalized intersections are undergoing reconstruction to upgrade the geometrics and replace outdated control equipment. Video image detection (VID) offers a promising alternative to pretimed signals as a way of providing actuated control at signalized intersections. The authors conducted a feasibility study of video image detection at intersections under reconstruction. This study involved three steps: 1. determine the effectiveness of a video image detection system as a loop emulator at a typical intersection under reconstruction; 2. develop a simulation-based methodology to assess the benefits of traffic-actuated control, compared to pretimed control, during the reconstruction of a signalized intersection; and 3. apply the methodology to the selected intersection to determine the costs and benefits of actuated control.