Most dont. I used to ride Blood Bikes which with all the markings, high vis etc looked just like police bikes . Several were in fact ex police bikes. And time and again you would come up behind someone and after a miniute or two there would be sudden braking down to the speed limit. Or they would suddenly more to one side of the lane to let you through. On other occasions it would be like Moses and the Red Sea ( or was it Dead Sea?). Fun but trying to "make progress" on a bike through traffic is fraught with danger
