TEXAS TRANSPORTATION CODE SECTION REGARDING TURN SIGNALS
§ 545.104. Signaling Turns; Use of Turn Signals
(a) An operator shall use the signal authorized by Section 545.106 to indicate an intention to turn, change lanes, or start from a parked position.
(b) An operator intending to turn a vehicle right or left shall signal continuously for not less than the last 100 feet of movement of the vehicle before the turn.