Part of the problem is that young people whiz along on sidewalks on these bikes at 20-30 mph. This is a hazard if you are pulling out of a parking lot and focusing on vehicular traffic in the road. While you are looking left, these bikes can come whizzing past from the right, and vice versa. I have almost hit them a couple of times, and other people have told me the same story.
Yes that happens to me a lot...............