On 7 May 2016, at approximately 4:36 p.m. local time, a 2015 Tesla Model S 70D travelling eastbound on US Highway 27A near Williston, Florida, collided with the side of a tractor-semitrailer making a left turn across the Tesla's lane. The car passed underneath the trailer, sustaining catastrophic damage. Its driver and sole occupant, Joshua Brown, died; the truck driver was not injured.
Automation involved
Vehicle data examined by the National Transportation Safety Board (NTSB) established that Tesla's Traffic-Aware Cruise Control and Autosteer systems, which formed part of the Autopilot driver-assistance suite, were engaged during the journey. These were partial driving-automation features, not a fully autonomous driving system. The technology could control speed and steering under certain conditions, but the driver remained responsible for monitoring the road and responding to hazards.
Crash circumstances and findings
The truck was turning across the eastbound lanes when the Tesla collided with its trailer. The National Highway Traffic Safety Administration (NHTSA) opened a preliminary evaluation of automated driving systems in June 2016. Its January 2017 review closed without identifying a safety-related defect warranting a recall. That regulatory conclusion was separate from the NTSB's later analysis of the collision's probable causes.
In its report adopted on 12 September 2017, the NTSB determined that the probable cause combined the truck driver's failure to yield the right of way with the Tesla driver's inattention and overreliance on vehicle automation. It further found that the operational design of the automated system contributed to that overreliance because it permitted prolonged disengagement from the driving task and use inconsistent with manufacturer guidance.
Attribution and evidentiary limits
This is a documented fatal collision involving active partial driving automation. The NTSB identified automation design as a contributing factor, but did not characterize the system as the sole cause. Its safety findings should not be treated as a judicial allocation of civil or criminal liability. This record therefore separates confirmed system involvement, official causal findings and questions of legal responsibility.
Investigative record
The NTSB investigation is identified as HWY16FH018 and its final highway accident report as NTSB/HAR-17/02. The supporting record includes the NTSB final report and public docket, together with contemporaneous reporting on the federal investigation and its closure.