Test drivers have been used by Tesla since 2016 to fine-tune its advanced driver-assist software. However, the efforts have been intensified over the past year, four current and former employees revealed. The company aims to launch the service by June 1, insiders said to Business Insider.

Tesla will launch its first robotaxi service in Austin, Texas, in June, CEO Elon Musk told investors on the company’s April 22 earnings call. Tesla vehicles are being tested on the streets of Austin now, Musk said, “to make sure that we deliver a safe product.”