Google has been quick to point out in the past that its self-driving cars haven’t been at fault for any of the accidents they’ve been involved in. In what could be the first incident that’s the driverless car’s fault, a California Department of Motor Vehicles report says a Google Lexus hit a city bus while in autonomous mode. According to the report [PDF] (first noted by writer Mark Harris on Twitter), the Google autonomous vehicle, or AV, was traveling in autonomous mode in the right-hand lane, as it was attempting to turn right on a red light. But the Google AV had to stop and go around sandbags that were positioned around a storm drain in its way, so when the light turned Green, the car let a few cars pass and then started to move into the center of the lane to pass the sand bags. “A public transit bus was approaching from behind,” the report says.