They would reach a stoplight, run around the vehicle, and then get back in before the light turned green again. Get our free mobile appAnother time, I saw someone get out of their car at a stoplight to confront a driver behind them. READ MORE: Top Five Things In Texas That Feel Illegal, But Aren’tBut I did wonder: Is it illegal to get out of your car at a stoplight? I couldn't determine whether it's illegal to get out of your car at a stoplight. So yeah, even opening the door at a stoplight would breach Texas law.