Drivers tend to follow one another much more closely than they do in the Midwest.
You may find this unnerving at first. You must pay continual attention to the traffic on your side of the highway and be prepared to respond quickly. There are frequent traffic delays, and sometimes traffic can stop altogether without warning. Last summer I took my eyes off my side of the road to indulge in a little rubbernecking. I glanced away for only a moment, but I very nearly missed the fact that everyone in front of me had slowed to a stop.