I posted the video below a few months ago, but this is not about the video - but is related, as it is about the proper method to enter a freeway.
In my 30 plus years of driving in California, I have twice seen someone 'panic' and stop on a freeway onramp, when they could not figure out how to merge.
In the past 3 months in Utah, I have seen it 3 times, unfortunately directly in front of me. The most dangerous thing you can do, short of driving drunk.
[ame=http://www.youtube.com/watch?v=UOm2D815Gyg]YouTube - ‪Typical Utah Driver‬‎[/ame]