Is it legal to park a car on a public road?
Sure ... however any posted signs that indicate time limits for parking must be obeyed. Some cities have rules governing overnight parking on streets that they govern, or place restrictions on certain sized vehicles like RV's and trucks.
As long as the public do not have access to that land, you can drive a vehicle that does not conform to current regulations. If the public do have access to the land (i.e. a supermarket car park) your car must be road legal as the area will be treated just like a normal road under the Road Traffic Act.
You don't need a license to drive a quad. Added: But they are not legal to operate on the public roadways anyway. no you just need a licence to drive road legal quads an scramblers no you do NOT need a car licence to drice a quad or a scrambler and stuff like that but for an off road quad or a scrambler you do NOT need a licence This vehicle requires no license because…