> Bikes, mile per mile are more dangerous than walking, this might be because of cars etc, It is because of cars. I went to FARS (http://www.nhtsa.gov/FARS ht

> Bikes, mile per mile are more dangerous than walking, this might be because of cars etc, It is because of cars. I went to FARS (http://www.nhtsa.gov/FARS http://www.nhtsa.gov/FARS) and queried accident causes for 2011. 42% of the accident causes start with the word "motorist". Many of the other causes would also simply not exist in a world without motor vehicle traffic, e.g., "Bicyclist Ride Through - Sign Controlled Intersection" -- this means running a stop sign, and it isn't something that would kill you in a post-apocalyptic world. In fact, the only cause I can see which is clearly not related to the presence of motor vehicles are the categories "head-on: bicyclist" and "head-on: unknown". When I click on cases with causes listed as "Bicyclist Ride Out" or others like that, I see a form that lists a motor vehicle as being involved. I think you're missing the biggest point here, and that is the fact that biking burns less calories per mile than walking does. A quick Google search: http://www.livestrong.com/article/135430-calories-burned-biking-one-mile/ http://www.livestrong.com/article/135430-calories-burned-bik... http://walking.about.com/cs/howtoloseweight/a/howcalburn.htm http://walking.about.com/cs/howtoloseweight/a/howcalburn.htm These sources say if you weigh 190 pounds, you burn 47 calories per mile on bike going 10-12 miles/hour, but at least 94 calories per mile when you walk 3.5 miles/hour. You cover the same distance in 1/3 the time and burning 1/2 the calories, or you cover 2x the distance with the same amount of energy, or you cover 3x the distance in the same amount of time for only 50% more calories. (Edit: I got the math wrong earlier.) The fact is, modern city-dwellers are simply not used to walking or biking long distances. Walking long distances sucks a lot, it's brutal on the body. Far worse, per mile, than biking. At worst, you can walk your bike and load it down with more than you could carry, or you could abandon your bike.