Hashem sent this traffic to make you better! Slow down, learn Mishna by heart, listen to a tape, talk to the kids in your car, call your mother, let a couple of people in front of you, drink coffee slowly, review LSAT, meditate, solve Fermat theorem. All provided you can do it safely, of course. I notice that when I am doing something productive, I am a safer and better driver as I am not in a hurry to get somewhere, I am OK to let others go before me – I would even break on yellow (not a minhag in my area) just to finish the sugya!
