I think many people are incredibly bad at judging the speed of unfamiliar moving objects. They get lots of training judging car (large object) speed, but their

I think many people are incredibly bad at judging the speed of unfamiliar moving objects. They get lots of training judging car (large object) speed, but their brains just cant properly guesstimate bike speed or something (little practice) -- like a non-baseball-player person trying to hit a fastball or something.