Driverless cars could be chugging through the District within five years if D.C. lawmakers and Google get their way.

Supporters of the cars testified at a hearing before the D.C. Council’s transportation committee Tuesday as it considered a bill legalizing the vehicles, saying driverless cars would cut down on crashes and congestion and improve the environment. The cars would be able to eliminate human error — which causes about 90 percent of all accidents — and take the fastest routes to avoid traffic, supporters said.