1. Can polystyrene golfcarts move at real-traffic speeds? And be light enough to not hurt anyone even when they contain fuel, an engine, a human/backup driver a

1. Can polystyrene golfcarts move at real-traffic speeds? And be light enough to not hurt anyone even when they contain fuel, an engine, a human/backup driver and the recording equipment? I'm not an expert but it seems unlikely. 2. I understand that Google does the vast majority of its testing without any iron at all, but rather tests new software using recorded input.