The installation of traffic signals follows a nationally standardized process that is outlined in the Texas Manual of Uniform Traffic Control Devices (TMUTCD). There is a set of criteria that must be satisfied before a traffic signal can be installed, most of which are based on traffic volumes. Not every street can be given a traffic signal, so traffic volumes are a large factor in determining which intersections will be signalized.
Distance Between Traffic Signals
In addition, traffic signals must be spaced a certain distance apart in order to function well. The intersection of 2 major roadways is always assumed to be a future traffic signal location and then other potential locations must be spaced an appropriate distance away. As other traffic signals are added at minor intersections, it further limits the possible location of additional traffic signals.
Time Frame for Installation of a Traffic Signal
Finally, the time frame for the installation of a traffic signal is primarily determined by the funding available to us each year. All of the intersections that meet the necessary criteria are prioritized each year based upon the amount of traffic they serve, an analysis of the conflicting movements, and other factors. The City then assigns the available funding to the top-ranked locations.