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Traffic rules basically give drivers a way to deal with other vehicles going different speeds. So a the driver of a scooter going 20 mph and the driver of a car going 40 mph can share the same road, just like a driver of a truck going 40 mph can share the road with the driver of a car going 60 mph.

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And yet, that same car can go 80 or 90 or even over 100 mph, which would be illegal on any road. Why?

Most motor vehicles could attain those speeds, and 100 mph isn't illegal on all roads.

On a steep enough descent, a cyclist could get up to speeds beyond 50 mph, which really isn't safe given the equipment.

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