What to do if you observe lights/sirens behind you
Immediately drive to a position parallel to and as close as possible to the right-hand edge or curb of the roadway and clear of any intersection. Keep your vehicle stopped until the emergency vehicle has either passed or wait for the officer to approach your car.
If you're being pulled over and an officer is approaching your vehicle
Stay in your vehicle and keep your hands visible. If it's dark outside, turn on your interior dome light. Follow the directions of the officer. Texas law requires drivers to present their driver’s license and proof of financial responsibility (insurance) upon request from a peace officer. If you are issued a citation, accept it – even if you don’t agree with it. Accepting and signing the citation is not an admission of guilt and you will have the opportunity to contest the citation in court after the fact.
If you're approaching a stationary emergency vehicle
If you're approaching a stationary authorized emergency vehicle, with it’s emergency lights activated, the law requires you vacate the lane closest to the emergency vehicle if the highway is equipped with two or more lanes traveling in the direction of the emergency vehicle OR slow to a speed that does not exceed 20mph less than the posted speed limit. If the posted speed limit is less than 25mph you must slow to a speed not to exceed 5mph.
You are traveling on I-10 and you see an emergency vehicle stopped on the right shoulder of the road with it’s emergency lights flashing. You should move to the left hand lane. If that movement is not safe or possible you should slow your speed to no greater that 55mph (20mph less than the 75mph limit).
You are traveling on Frydek Road (a small residential street with no marked lanes). You see a police patrol vehicle has a motorist pulled over and the officer’s emergency lights are flashing. Since the speed limit on Frydek Road is 30mph, you should slow to a speed of no more than 10mph as you pass by them.
You are traveling on Park Road (a small road inside one of Sealy's public parks that has a 15mph speed limit). You approach a stationary squad car with it's emergency lights flashing. Since the speed limit on this road is 15mph you should slow to 5mph as you pass the squad car.
Reasons you can be pulled over
Peace officers may stop a motorist, bicyclist or pedestrian for several different reasons. These reasons can include traffic violations, probable cause to make an arrest, reasonable suspicion of criminal activity based on personal observations and information from other peace officers, the police radio or a witness or outstanding warrants. A peace officer can also stop you for minor infractions such as darkly tinted windows, inoperative or faulty equipment, failing to signal, no front license plate, etc…
Officers are also permitted to conduct “Terry Stops” of vehicles for questioning if the officer reasonably suspects an occupant in the vehicle has committed, is committing or is about to commit a crime. The officer is not required to have probable cause to arrest the individual at the time of contact, but may have reasonable suspicion that the individual is involved in criminal activity. Evidence obtained through a “Terry Stop” of a vehicle is acceptable as long as it was the result of a reasonable suspicion that a crime occurred.