Also, the reason why walking, running, or even biking to get around 99% of the US isn’t feasible is because the distances are too vast. The average commute time for people in the US is 26.7 minutes and most of that will be on a highway. Covering the same distance on a bike would take 3-10x longer (why 10x? Because of soooo many bridges that don’t allow bikes or pedestrians!).