This is especially obvious in Southern California where they've been putting up "emergency access roads" that have automated gates that respond to IR flashes fr

This is especially obvious in Southern California where they've been putting up "emergency access roads" that have automated gates that respond to IR flashes from emergency vehicles so commuters can't use the suburbs as through streets but emergency services can still drive through in case of fire or other emergency and pedestrians can walk through. They're required for developments that want to stay isolated. One of those roads splits my neighborhood into two clear halves with each half only access by one artery, so that commuters don't go gunning through the neighborhood.