Why don't we have walking vehicles?

In two words, extreme complexity. Wheels are simpler, cheaper and more energy-efficient. The only advantage a walking vehicle would give you is that it can go over terrain that a wheeled vehicle can't. I think we'll see military walkers going into service in the next 20-30 years.

Rolling wheels are way easier to make work, be reliable, and build for a reasonable price. Your question does bring up what would tire stores look like if vehicles walked? Would they sell walking car shoes? Modern people would probably prefer running vehicles to be comparable to what they are used to.

Haven't you ever seen the Empire Strikes Back?

Imperial Walkers were the absolute worst piece of warefare equipment ever invented. You saw just how easy it was to wrap the robotic legs and knock the whole thing over.

A roger says, we do have them - ugly and noisy - here is video of Big Dog https://www.youtube.com/watch?v=W1czBcnX1Ww and to the right on that page are some alternatives.

we do

look here:

http://armytechnology.armylive.dodlive.mil/index.p...