Sorry, and back on topic, I don’t have much of a problem with motorbikes in the asl, provided they don’t fill it up so cyclists can’t get in.
From the highway code:
Advanced stop lines. Some signal-controlled junctions have advanced stop lines to allow cycles to be positioned ahead of other traffic. Motorists, including motorcyclists, MUST stop at the first white line reached if the lights are amber or red and should avoid blocking the way or encroaching on the marked area at other times, e.g. if the junction ahead is blocked. If your vehicle has proceeded over the first white line at the time that the signal goes red, you MUST stop at the second white line, even if your vehicle is in the marked area. Allow cyclists time and space to move off when the green signal shows.
[Laws RTA 1988 sect 36 & TSRGD regs 10, 36(1) & 43(2)]
So any vehicle can be in an asl, provided they entered it before the light turned red. Otherwise it’s the same offence as jumping a red light.