Driving around with a broken tail light or turn signal is illegal. Just think of the movie scene where the otherwise uncatchable mobster is pulled over for having a broken tail light, and that's when they discover the body in the trunk! Hopefully there's nothing in your trunk but groceries, but if your car or truck suffers some tail light destruction, you could try this. Only in desperation should you drive down the road with your car's rear end in such a state of disgrace, but sometimes you've no choice. Get out the tail light repair tape.