It seems every advice has been said. But there is one thing...
I know there are some geniuses here who think it was a good idea to smoke and tint their tail lights. I don't care how much you think how bright your brake lights still are. You're just asking to be rear ended. No one, especially the elderly, have as good a vision as you. Ever tested your awesome-o cool as fawk tails on a bright and sunny day? It takes away the reaction time of the person behind you. A lot of stupid rednecks and ricers smoke their tails around here. When I'm behind them I have to be extra alert b/c the dumbass decided to tint his tails, so when he does brake, it's sometimes difficult to decide if he's actually braking or not. And when I do lose that second of reaction time, I have to brake harder.
Grandma Sally or Suzy cellphone won't be as forgiving. And when you do get rear ended, it won't be guaranteed as their fault since you made your tail lights...darker...a safety feature that was made to alert people behind you know you're slowing down.
/rant