>>>Have you ever tried a 4 wheel steering vehicle?
>>
>>Not with an actual steering wheel. But in our supermarkets all carts have all-four-swivel wheels, if that counts. When I put the twins (granddaughters, currently around 10kg each) in a cart to ride them over the parking, even the 1% drain slope matters. I have to pull to the side to go straight.
>>
>>"Did you mean 4 wheel drive?" said the google.
>
>
>I mean steering such as the Mazda 929, Porsche 911 ,GMC Sierra 1500 Denali,Nissan Skyline GT-R and Dodge Stealth.

Didn't even know the thing was commercially available, i.e. in cars. I thought those were too expensive to have on anything short of huge special trucks or elbow buses (aka accordion buses), or some special racing jobs.

The video is useless. The guy explains the theory which is clear to me anyway even without watching it. Then we see, in the last minute, some static machine parts. I want to see a top view of a maneuvering vehicle (why does he say "top down view" in the video? Isn't "down" implied?).