The shuttle, which is being run through a partnership of vehicle company Navya and transportation firm Keolis, had already been through a successful controlled trial in Vegas. It is back up and running Thursday, said Chris Barker, a Keolis spokesman, who added that the shuttle couldn’t back up itself to avoid the collision because there was traffic behind it. “The autonomous system operated as it was supposed to,” he said.

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Las Vegas’s shuttle is not the only driverless vehicle to end up in a crash that wasn’t its fault. In fact, tests from Google’s driverless car project reports that most — but not all — of the accidents it’s logged appear to be the fault of a human, in some capacity. In some cases, it’s been the fault of the human sitting behind the wheel of the driverless car; other crashes have been due to outside vehicles. The same seems to hold true for driverless vehicles being tested on roads in California, according to the accident reports that testers are compelled to file with the state.

Keolis Transit America’s Maurice Bell, its vice president of mobility solutions, told the Review-Journal that the firm would take the information from the crash and learn from it. “That’s probably the positive point of all this,” he told the newspaper, “is that we have extensive data to be able to tell us what occurred and what we could do in the future to improve upon.”

The debate over driverless vehicles and their effect on road safety continues to be a hot-button issue, as more cars take to the road. Nevada has allowed testing of autonomous semi-trucks. Lyft said this summer that it’s planning to launch self-driving ride-shares by the end of the year, though there will still be someone in the driver’s seat. California recently approved rules that will let autonomous vehicles drive without anyone behind the wheel. And a recent study from the RAND Corporation, published earlier this week, made an impassioned case for the government to allow driverless cars onto the road even if they’re not yet “perfect,” if they can prove they’re safer than what we have now.

“Waiting for the cars to perform flawlessly is a clear example of the perfect being the enemy of the good,” said RAND researcher Nidhi Kalra.