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MobileCollar5910 t1_j6av6zb wrote

Reply to comment by teem in non-Cambridge native here. wtf is this? by FlimsyRaisin

Green flashing is for a pedestrian controlled intersection. It is special to indicate pedestrians are likely to cross the area, and the signal will change suddenly from a pedestrian hitting the signal to cross alewife Pkwy and Salem has examples.

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teem t1_j6cmkna wrote

Thanks! I've seen both!

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