As used in this chapter, the following terms shall have the meanings indicated:
Any vehicle propelled otherwise than by muscular power, excepting such vehicles as run only upon rails or tracks, found in any public street, highway or lands and not bearing current registration plates, remaining stationary and unused for more than 14 days consecutively on public streets, highways or lands or 30 days upon any private lands or premises.
Any automobile which is no longer in actual use as a motor vehicle, which is wholly unfit without rebuilding or reconditioning for use.for highway transportation or which has been discarded for use as a motor vehicle.