Proterra founder Dale Hill: electric bus charges, discharges on San Francisco hills - SmartPlanet

Proterra founder Dale Hill: electric bus charges, discharges on San Francisco hills - SmartPlanet: "this bus can go 30 to 40 miles at 11 to 13 miles per hour before it needs a recharge, which it gets by passing under a contact arm at a bus stop or a bus yard."