Get the DealBook newsletter to make sense of major business and policy headlines — and the power-brokers who shape them.

__________

Mary T. Barra, the chief executive of General Motors, said the company is “on track” to roll out a ride-sharing service in 2019 that would rely on autonomous vehicles, a development that would advance the already-heated race to bring a self-driving car to market.

“We’re on track, with our rate of learning, to be able to do that next year,” Ms. Barra said at DealBook’s Playing for the Long Term conference. She added that the company had a strategy to show how its vehicles are safer than human drivers. The vehicles can currently run safely at speeds of up to about 30 miles per hour, and the service will be limited to a small geographical area, Ms. Barra said.