(Bloomberg) -- A Texas man said the Autopilot mode on his Tesla Model S sent him off the road and into a guardrail, bloodying his nose and shaking his confidence in the technology. He doesn’t plan to sue the electric-car maker, but his insurance company might.

Mark Molthan, the driver, readily admits that he was not paying full attention. Trusting that Autopilot could handle the route as it had done before, he reached into the glove box to get a cloth and was cleaning the dashboard seconds before the collision, he said. The car failed to navigate a bend on Highway 175 in rural Kaufman, Texas, and struck a cable guardrail multiple times, according to the police report of the Aug. 7 crash.

Autopilot missed curve

“I used Autopilot all the time on that stretch of the highway,” Molthan, 44, said in a phone interview. “But now I feel like this is extremely dangerous. It gives you a false sense of security. I’m not ready to be a test pilot. It missed the curve and drove straight into the guardrail. The car didn’t stop — it actually continued to accelerate after the first impact into the guardrail.”

Molthan’s experience — while not as serious as a fatal crash that federal regulators are investigating — still highlights the challenges ahead in determining who is to blame when semi-autonomous vehicles are involved in accidents. Insurance claims involving Tesla’s Autopilot are largely uncharted territory, in part because driver behavior is still a contributing factor.