How can a biker be treated exclusively as a car? E.g., what happens when the biker reaches a stop light that does not detect them? Only a pedestrian would use t

How can a biker be treated exclusively as a car? E.g., what happens when the biker reaches a stop light that does not detect them? Only a pedestrian would use the walk sign. How can they be treated exclusively as a pedestrian? Sidewalks are not designed for any user faster than about 3 mph.