If you can, travel by public transport rather than driving. This will give you time to read a newspaper, do the puzzles, read a book, or just watch what is happening around you or chill out. My journey used to take nearly an hour, and sometimes I got so involved in one or more of these activities that I was actually sorry when the journey came to an end.
If you are driving, leave yourself plenty of time, so that you are not driving on your nerves, by which I mean you are not anxious every time there is a hold-up or someone overtakes you or cuts in front of you, Turn on the radio, and listen to discussion or play your favourite music, or play a talking book or language course - do whichever keeps you calm without distracting you too much. This will all make you enjoy your time a bit more, and stop you getting angry with the behaviour of other road users, which is a prime cause of stress. Just smile and have patience with other people and accept external problems like road works without inwardly seething - allow yourself to be peaceful. The important thing is to give yourself more time than you need for your journey so that you don't feel anxious and pressured by every minor hold-up (I ought to take my own advice there!).