I'd say yes, it's often a big grouping and they like blocking the road and while not actively aggressive, they do the 'hilarious' getting in the way thing or 'chicken wheelying' right at you, and given you're stuck effectively in a tunnel filled with a couple of dozen surly, adolescent males (I've yet to see a female), it can be intimidating, more so I suspect if you're not a bloke with a skinhead.