One of the questions of my state's written driver's exam was:<p>"How many inches of water can float a small vehicle"<p>Note the use of the word float, not drag. Their answer is 6 in.<p>This is probably wrong. Can anyone give me an example of:<p>- A street legal car that can go on the freeway with standard tyres that will float in 6 inches?<p>Since I'm in a rural state,<p>- A street legal car that can go in the freeway, with any street legal tyre installed (even if it wouldn't fit in the tire well). I'll even allow the exaggerated tyres not lift the car or weight it down.<p>You can assume the tyre is a cylinder (not a toroid) and is massless.