Federal safety regulators escalate the investigation of Tesla's self-driving assistance technology after crashes and visibility issues.

The NHTSA is expanding its investigation into how safe Full Self-Driving is under less-than-ideal road conditions.

Tesla’s Full Self-Driving system is facing an expanded investigation by the National Highway Traffic Safety Administration over its safety during poor road visibility conditions, as previously reported by Reuters.

The last petition regarding Teslas and sudden unintended acceleration involved claims regarding a voltage spike in the car’s inverter. Not so here—Costas Lakafossis presented NHTSA with a lengthy white paper that tries to prove that human error isn’t the problem but that there are instead “very specific patterns that repeat themselves in almost every one of these SUA accidents,