Now here's a group of concepts.
1) if people cycled to work, they would live at least 1/3 of the distance from work, and probably less than that. If that wouldn't reduce traffic levels - you can call me irrational.
2) As with joggers, peoples' immune system would be constantly alert, thus improving health.
3) Never mind bus lanes, footpaths in cities would need widening.
4) the army of idiots that currently terrorise the roads would refuse to buy a bell let alone use it, and expect pedestrians to have eyes in the back of their heads. Try walking the canal towpaths and you will see it.
5) if it is cars that are being targeted, mobility scooters would be more numerous and the idiot army would cry foul if you criticised them for their irresponsibility. "But I'm disabled" is the cry, NO! clue's in the name "mobility" scooter.
6) electric bikes! speeds would rise, laws flouted.