Police spotting (junction watch)

That's bollocks, unless you're a foot tall. Every time I enter an asl in front of a lorry I look back and try to make eye contact with the driver. Wouldn't stop next to the cab though.

I think stonehedge's point is that quite often you don't know where you will be able to stop. If the ASL is full of bikes or motorbikes or if the HGV has (legally or illegally) stopped in it, then you are in trouble and may end up having to creep forward, dismount or RLJ to remain safe. Also, presumably you only enter the ASL if you know there's going to be time to turn and make contact with the HGV driver.