Not sure how they judged when to set off...
Watching the cross-lights and starting when they go amber?
Nope, it's a pedestrian phase beforehand. There's the increasingly ubiquitous countdown, but I wasn't sure if they'd be able to see that from as far back as they were.
I might have a go at it myself next week, for research purposes obvsly.
@Brun started
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Watching the cross-lights and starting when they go amber?