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As the others have said, you need to wait until straight-across traffic has passed. That this is quite a lot of straight-across traffic is down to the combination of the West Green Road/Alfoxton Avenue one-way system with the fact that the area west of Duckett's Common isn't filtered. There are only one-ways to deter one direction of rat-running (as, for instance, in the bit of Willoughby Road approaching Turnpike Lane). Measures like this are timid halfway houses that don't achieve much and make some forms of rat-running worse. Together, they mean that, as it's still possible to rat-run towards Turnpike Lane that way, you usually get quite a long queue of drivers from Alfoxton Avenue wanting to go straight across (the right turn there is, of course, from a separate slip designed to reduce conflict with traffic from Frobisher Road).
As ever, it's all hopelessly outdated stuff, right from the days in which the aim was generally to increase motor traffic everywhere, and it's long overdue that something is done about the whole area there. There was some kind of West Green plan a long time ago, but I can't remember what happened to that.
Oops.
The ones coming across are hooting.
It's a bit of a funky crossroad with my exit offset and the lights timed in my favour.
So my argument would be I've already joined the road they're trying to cross by the time their light has gone green, so they should be waiting for me.
But not worth the aggro.