  This paper implements a traffic signal control system by using real-time
traffic flow feedback. This system is designed to deal with two-lane
intersections. We construct an experiment field similar to the roads and
drivers in Taiwan using an autonomous simulation software called Virtual Test
Drive (VTD) released by MSC Software. We erect four cameras on the side of the
roads to get the image of the intersection, then transfer the image information
into traffic flow information. Analyze the traffic information in each lane by
using Greenshields traffic flow model. Control the traffic signals by using
Webster's method to increase the performance and soothe the traffic.
