Texas Transportation Code - TRANSP § 545.156. Vehicle Approached by Authorized Emergency Vehicle

(1) an authorized emergency vehicle using audible and visual signals that meet the requirements of Sections 547.305 and 547.702;

(2) a medical examiner vehicle, as defined by Section 547.751, lawfully using a visual signal in accordance with that section;

(3) a vehicle operated by a justice of the peace for a purpose described by Section 547.752 and lawfully using a visual signal in accordance with that section;  and

(4) a police vehicle lawfully using only an audible or visual signal.

(1) yield the right-of-way;

(2) immediately drive to a position parallel to and as close as possible to the right-hand edge or curb of the roadway clear of any intersection;  and

(3) stop and remain standing until the authorized emergency vehicle has passed.