[phillc]

I always wondered about filtering in the UK, especially betwen the lane of oncoming traffic, as opposed to filtering between two lanes going in the same direction as yourself.

I ride in London almost every day and initially (from Aust. 5 years ago) couldn't believe my eyes with what I saw. Now, I do it as much as the next rider - couriers excepted.

What is the actual law about this?

I went the wrong side of a median strip once and a panda about 5 cars ahead turned on lights and gestured me over. Said "You know better than to go the wrong side of that strip. Don't do it again, idiot". But that's as near as I've come to being stopped.

The other side of the filtering in heavy traffic coin is that they need to catch you first.

I only found out the other day that "undertaking" on a Motorway is illegal. I do it all the time when slow f*ckers won't get out of the far right lane.