does anyone know what the name is of the stick with a paddle on the end that you mount on the wheel, it sticks out to warn cars to give you distance when overtaking. I use my bike to go to my cleaning job and the high street is narrow, I'm always having cars trying to squeeze past and although I do get off and walk I still have to ride the bike so far. I've seen them being used but can't find the name or item online, many thanks