Gas-powered bicycles are an emerging boom vehicle for Tucsonans as a cheap and efficient way to get around the Old Pueblo. But their growing presence on Tucson streets has city officials concerned ...

HANOI, Vietnam(AP) — Vietnam is split between two visions: the rumbling, reliable gas-powered motorbikes that now rule the roads, and sleek, silent electric bikes the government says are its future.

Summer is coming in hot, and the impending heat is set to once again break the prior year’s record-breaking temperatures. For gas motorcycle riders, a scorching hot planet isn’t the only immediate ...