Texas Transportation Code - TRANSP § 701.003. Duties

(1) be a motorcycle rider when practicable;

(2) cooperate with the police department of each municipality in the county to enforce state traffic laws in that municipality and in the county;

(3) enforce state laws that regulate the operation of a motor vehicle on a highway, street, or alley;  and

(4) remain on and patrol the highway at all times when performing the officer's duties.