Las Vegas' self-driving shuttle service marked its return by getting into a minor collision, according to local NBC station KSNV News 3. French startup Navya's autonomous electric vehicle shuffles at around 15 MPH on a 0.6 mile circuit in the downtown Fremont East district. But, just an hour into its year-long trial (which follows a successful stint in January) the shuttle was hit by a delivery truck that was backing up.