Accept the things you cannot change. Put on soothing music or a shiur that calms you down. Understand that someone is going to cut you off and be prepared. If you tense up you will only have a harder time driving. If you relax and expect to be cut off, sit in traffic, etc. and accept the fact there is nothing you can do about it, you will be less likely to be driven mad. Understand that no one is out to get you. Don’t take it personally, everyone is in the same situation as you are, they are all trying to get to their destination for their own reasons whether it is to see a doctor, business meeting, shopping, go home or whatever. The city is very popular and very congested. If possible take the train and read a book. If not just accept that this is how it is.