Your friend wants to add red LED lights to the front grille of his passenger car, so that they shine forward. Is this allowed in Texas?

Correct answer: No, because a passenger car may not show a red light to the front.

Why

Drivers expect red lights ahead to come from emergency vehicles or school buses, and red lights on a car to mark its rear. A red light at the front of an ordinary car can make drivers yield when they do not need to, or misjudge which way the car faces. Texas law stops red lights visible from the front except where the law allows them, for example on police and other emergency vehicles.

Verified against Texas Driver Handbook · Prohibited Equipment · p. 22