That's one of the scary things about hiway driving. Let's take I94 through Chicago as an example. In light traffic you can go the speed limit and get right through Chicago in about 30 mintues. In heavy traffic that is moving well, you may have to go 10-15 MPH over the speed limit to just stay with the flow. If you attempt to go the speed limit you will become a hazard to everyone else on the road and risk a very good chance that you will be rear ended or side swiped. However, when there is that much traffic the speeds tend to go up and down in waves due to merging traffic. And even though you spend a considerable amount of time well above the speed limit, it still takes you an hour to get through town in heavy traffic due to those waves. And if you attempt to leave enough safety distance between you and the car in front of you, someone else will just cut in, so you have to brake, which causes everyone else behind you to brake, which causes a wave in traffic, etc...
So, my advice to everyone is try to go with the flow of traffic. Tailgate relentlessly so as not to disrupt the flow of traffic. Stay in the right lane if you are not willing to risk your life for the good of your fellow man and never use your turn signals as it just causes someone else to use their brakes. :thumbsup: