it may or may not be lawful. When it is done in situations where it causes an undue interuption of motorized traffic, it is extremely inconsiderate and it makes the rest of us look like arseholes.

i see this sort of militant VCing from time to time and it pisses me off to the point where i'm almost hoping the cagers run them down.

after reading that article, i suspect that mr truck driver dude might just be talking about such cyclists.