as pointed out, the reason that cars being shown to be slower than walking in many cases is moot because cars provide benefits which more than offset. 1. Weather protection 2. Cargo transportation 3. Ease of movement for the disabled 4. Additional safety for those toting along small children 5. Some level of protection/isolation from others

The argument in favor of bicycling in lieu of cars falls prey to the same reasons. There are pro and cons so we must always fairly assess them before standing up and declaring one method worse than another. In fact none ever are all the time