A full stoplight requires a full stop which defeats a lot of the benefits of a proper zipper merge where traffic just keeps flowing with no stops.
In a more general sense on a highway any time a car comes to a full stop you have the chance to create a phantom traffic jam as the stop travels back along the incoming stream of cars.
In a more general sense on a highway any time a car comes to a full stop you have the chance to create a phantom traffic jam as the stop travels back along the incoming stream of cars.
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