4 cars is nothing. There are occasionally people who drive super slow (25 is a 55) down the most common way to come into town. It's typically too busy to pass. Last week I was stuck in a line of at least 20 cars with no chance to pass. The idiot in the front should have pulled over, there are plenty of spots to do so and allow people to pass without disrupting or endangering anyone.

Everyone should know in the winter the roads typically suck. You should leave a little earlier and expect the drive to take a little more time. Just because you can't plan accordingly, doesn't mean that everyone has to move out of your way so you're not held up.