In early 2011, Dorian Maxwell decided he'd rather not set foot on a Muni bus. That's a decision thousands of fellow San Franciscans make every day -- but in Maxwell's case, it loomed larger. He was a bus driver. And he couldn't help but observe that atop Coach No. 5427, the electric bus he was assigned, a 600-volt conducting wire was wrapped tightly with a jury-rigged application of what appeared to be black plastic garbage bags.