As far as I see it, the motorbike use the correct filter lane to enter the ASL
Err...no he didn't. That's a left turn lane with a sign pointing to turn left and a four-foot arrow on the asphalt. The motorcyclist ignored the signage (in itself, a traffic offence I think?) in order to get into the ASL on red against HC 178. So two traffic offences, methinks
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Incidentally, I am not robbing motorcyclists of the ability to filter, just don't like 'em barging into the ASL where they shouldn't be anyway. It's bad riding to cut through on the inside of traffic, change lanes without indicating etc. What happens if I am going through the junction when a dirty great big motorbike suddenly appears on my left? - wait a minute, that
did happen to me!. A collision is more likely under these circumstances. Riding through this junction going straight on in primary, I had a car driver recently undertake me in the left lane only to swing back into the centre lane in front. Not good driving and certainly not good riding from motorcyclists who do this. I don't do it on my bicycle.
I do realise that motorbikes can play a part in reducing congestion, but they should not choose which rules they want to follow and abuse the cycling facilities. I have seen motorbikes ridden in the mandatory feeder lane for some ASL's in Bristol and London.
Bottom line on all this folks is that undertaking (technically a nearside overtake) increases the risk of an accident.