I bought a General Electric Elec-Trak lawn tractor back in the 70's.  My wife still won't let me forget that!  I thought it was a good idea, and it was.  It just wasn't successful.  So I guess it really wasn't a good idea.  I'll wait a while to see how the cars work out.  By the way, who pays the road tax for other peoples use of this on the roads, Me?