Patent ID: 8777623

Claim:
An apparatus for teaching defensive driving comprising: a hub unit configured to attach to an axle of a vehicle via a plurality of wheel nut studs, wherein each of the wheel nut studs is configured to: (a) replace a wheel nut that secures a wheel to the axle and (b) secure the wheel to the axle; and a housing unit comprising: (i) a height-adjustable member operable to adjust an amount of friction between the wheel and a road surface by adjusting a height of the wheel relative to the road surface; (ii) a swing arm member configured to engage a portion of each of the hub unit and the height-adjustable member, wherein one end of the swing arm member is pivotally affixed to the housing unit; (iii) a wheel-height adjusting mechanism coupled to the height-adjustable member and configured to operate the height-adjustable member to adjust the height of the wheel relative to the road surface; and (iv) at least one wheel assembly, wherein the at least one wheel assembly comprises at least one support wheel configured to swivel about a vertical axis and to contact the road surface.