When a city of 50,000 or greater population (latest federal census) desires to install a traffic signal using local funds within its corporate limits on a highway of conventional design which is on the state highway system, TxDOT must conduct a traffic study to determine

When the district engineer approves the project by signing the Traffic Signal Authorization Form, the district should then forward a copy of the signed authorization form to the city to serve as their record of approval for the proposed traffic signal installation.