Bill Roper's Journal

I think it's illegal in most if not all states. It's called "impeding traffic".

Even if not technically illegal, they'll still try to ticked you for it. I read on BikeForums fairly often of bicyclists getting ticketed for "impeding traffic." In reality if taken to court this gets thrown out most of the time, and gets thrown out on appeal every time it's taken high enough. But most people just pay the fine. Most of the time things don't have to be illegal, you just need to irritate a cop.

Two observations:
1-This has been going on for decades. First time I heard of it was in the 70's.

2-The van driver really missed his opportunity. Once you get by, you get in front of one of the drivers and slow to 45 MPH, breaking up the rolling roadblock. Of course, most drivers don't give a damn about anyone else on the road as long as they've gotten their way, so that may be a bit much to ask.

Personally I do drive actually below the limit in Michigan (usually 60 to 65 in our ubiquitous 70 zones). I do go about what everyone else id soing (70 in a 55 zone) in Chicago, but my numbers there are skewed because the only time I drive there is when I'm in the beginning/end of a long trip, and I do tend to drive a bit faster when I'm driving hundreds of miles at a stretch.

But I do take advantage of opportunity when it happens; if I come across a semi in the right lane driving a fair amount below the limit, like maybe 60 in a 70 zone, I will drop in and tail him. I'd rather drive slower anyway.