I live in the northern part of Kentucky, which the rest of Kentucky calls Ohio.
As you travel northeast to New Jersey, Connecticut, New York,
Massachusetts or west to Los Angeles you will find that driving in these states is at your own risk. The drivers in those states are maniacs.
This also holds true in all of California. For a non-Californian, driving there is an excercise in white-knuckles.
And drivers are polite. They are either courteous to a fault, or have a bad case of freeway phobia and will stop on the entrance ramp rather than merge. At certain times, once they stop, you can be there behind them for quite a spell. If they couldn't merge at speed, can you imagine them jumping in from a stop? You just have to wait.