I wiped out over my handlebars on my commute after dark on this invisible lip at the intersection. The lip is ~3" high and stopped my bike short. I've biked 20,000 miles in the last 5 years, and have never had as many crashes or near-crashes because of road conditions like this in the 6 months of living in Oakland.
A. Don't Know / No Answer
A. This is a lip, like an unintentional speed bump. Spans the width of the lane.