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ASLs are pointless. We should just move into primary where we stop in the traffic queue rather than filtering to the front.
They're useful if the roads are chock full of motor vehicles, which is most of the time when I'm commuting in London.
If the road up ahead is clear I'll sit in primary behind the cars that were already there; no point applying the MGIF and then holding them up unnecessarily.
During my commute I'll (quelle horreur) happily take the slightly greater risk of filtering up the inside as I'm on the lookout for possible left hooks all the time. I tend to move out into primary when approaching a junction in order to prevent it. Likewise I'll generally filter up to the ASL at red lights as I'm aware of the timings of most of the lights on my commute and, if I do get it wrong, my natural instinct is to get in to primary to go through the lights rather than risk continuing to filter up the inside across a junction.
If I didn't do any filtering at all my 35 minute commute would take over an hour and I'm not sure it would be any safer.
controversial opinion
ASLs are pointless. We should just move into primary where we stop in the traffic queue rather than filtering to the front.
Two benefits - (i) no dumb close passes from frustrated traffic that you've just filtered past and (ii) no risk of lights turning green whilst you are still filtering and getting left hooked as you may not be visible.
That's what I do - am I missing anything?