On my drive to work I like to imagine that every good deed I do comes back to me 10 fold.
At the end of one of the roads near our home is a very busy road that I must cross during rush hour traffic and make a right hand turn. Remember I live in England and we drive on the left side of the road so this is equivalent to making a left turn in America or on the continent.
I usually manage to get out into the middle without much trouble but then I have to rely on the generous nature of other drivers to get into the flow of traffic. There are immediately 3 intersecting road which must also merge into the road I just merged into. I always let at least one car go in front of me from each intersection.
What always amazes me are the number of drivers who I have let in who don't let a car go at the next intersection. I believe this is bad commuter karma.
I reckon if you are nice and considerate to everyone you share the road with, eg drivers, bicyclists, pedestrians, mums with pushchairs, then everyone will be nice to me. If I am rude and in too big of a hurry to be nice to anyone then someone will hit me.
Practice Commuter Karma everyday!