I drive a semi-truck for a living. I do not have hazmat on my license. I was going home the other day though one of the tunnels in Pittsburgh, and I'm looking at 2 Tesla's one in front of me and one in the pass mirror near the end of my trailer. Got me thinking that if I was hauling a load of batteries for Tesla's would I be hazmat and not allowed through the tunnel? Can't get a firm answer in my short attention span, but it seems so. Meanwhile they allow these cars themselves through the tunnel or on the many bridges in the area. They burn very hot and do not go out as mentioned. A few years back construction workers set fire to plastic pipe in the structure of a bridge in the area and it did quite a bit of damage to the bridge steel. Granted the car would be on top with concrete insulator, but a electric truck or tractor trailer (bigger battery) makes you think. Now I get the argument that I'm allowed to carry over a 1000+ pounds of diesel fuel through and on these structures, but diesel is hard to light and fire departments are well versed in a class B fire, a class D fire is a completely different animal.