France has initiated an urgent probe into a series of alarming motorway crashes attributed to “phantom braking,” a phenomenon where vehicles unexpectedly come to a sudden halt at high speed without any apparent reason. This investigation was prompted by a terrifying incident near Lyon involving Joanna Peyrache, whose Peugeot 208 abruptly decelerated from 65mph to a complete standstill on the motorway. The incident resulted in a rear-end collision, severely damaging her vehicle, though miraculously, she escaped without serious injuries. Neither her insurance company nor the other driver’s accepted responsibility, leaving her to seek answers independently.

Peyrache’s ordeal has since brought to light over 300 similar reports from drivers claiming their cars also stopped without warning. A common thread among these cases is the involvement of vehicles equipped with Automatic Emergency Braking (AEB) and other advanced driver-assistance systems designed to prevent accidents. Instead, these high-tech gadgets appear to be inadvertently triggering crashes by misinterpreting shadows, roadside signs, or even harmless obstacles as potential dangers.

Experts are concerned that the problem extends far beyond France, warning that as modern cars increasingly rely on these sophisticated driver-assistance systems, a single software glitch could endanger millions. This issue has already had tragic consequences, including a fatal incident in December 2023 where a passenger died after her car braked sharply on a motorway and was subsequently hit from behind. Another driver, Aurélie Tormos, faced conviction for involuntary manslaughter after a similar unprovoked slowdown led to her passenger’s death, prompting campaigners to demand a review of such convictions if phantom braking is proven to be the underlying cause.

Public concern has grown, leading to a petition that has gathered over 450 signatures, urging members of parliament to launch an immediate inquiry into the malfunctions of automatic braking systems. The petition highlights that multiple car brands are affected, with the consistent element being the presence of driver assistance systems, particularly for braking. Christophe Theuil, vice-president of the French Federation of Automotive Expertise, explained that poorly adjusted sensors can lead to errors, likening it to a nearsighted person driving without glasses, where a mere one-degree difference can cause the car to brake for non-existent objects.

Officials have confirmed that the investigation will thoroughly examine the sensors, algorithms, and even prevailing weather conditions to determine the root cause of these malfunctions. Despite the widespread reports across different makes and models, there has been no official recall in France to date. This ongoing safety concern, while distinct from issues like the recent UK airbag recall involving Citroën and DS models, collectively raises critical questions about automotive safety standards and the speed with which manufacturers address potential defects. Industry insiders fear that the “phantom braking” issue could severely erode trust in emerging self-driving technology, which heavily relies on the same type of sensors now under scrutiny, potentially delaying the broader rollout of autonomous vehicles if a definitive solution is not found.