i'm another one of those people who will slow down to a crawl in that sort of situation. it's nice to tailgate them back once they pass, but my truck has the worst acceleration in the world so it's usually impossible. getting on the highway in that damn truck is the worst; i'm always stuck behind someone who wants to go 10 mph down the entire onramp, then floors it as soon as they get on the highway, leaving me trying to merge into speeding traffic going about a third of the average highway speed.