There is so much more to cycling safety than this. Many roads don't have shoulders, or don't have the width for dedicated bike lanes. Drivers are often very hostile to bike riders who take up car lanes, esp. if the bikes go under the speed limit and if the cars have to wait at all.

Blindspots. Intersections. Parallel parking/parking in bike lanes. Safe and clean parking of bikes at destinations.

The entire design and build requirements of roads have to be reconsidered to make cycling/scooters first class citizens in cities. As it stands in the US, most cities are pretty dangerous for cyclists.