The report, ADAS Collision Prevention: Real-World System Performance from U.K.-based Ascential Technologies, outlines ways the collision repair sector is undermining the effectiveness of key safety systems. Drawing on results from test-track evaluations, lab-based sensor testing and industry data analysis, the paper paints a detailed picture of how often ADAS features underperform in real-world driving after being serviced or repaired.
"Key findings demonstrate that improper calibrations led to significant degradation in system performance, including failure to meet key criteria in lane departure warning, forward collision warning, crash imminent braking and pedestrian automatic emergency braking scenarios," author Brunno Moretti wrote in the whitepaper's introduction. "In contrast, calibrations performed under controlled and precise conditions consistently met or exceeded the performance benchmarks."
Lane-keeping systems, blind spot monitoring, adaptive cruise control and automatic emergency braking are among the systems flagged for degraded performance post-repair. In many cases, collision repair procedures either omit required calibrations entirely or apply them incorrectly. Even seemingly minor repairs — such as bumper replacement or windshield work — can impair or disable safety features if sensor realignment is not performed to exact manufacturer standards.
The research shows that repair shops routinely return vehicles to customers with partially functioning or deactivated ADAS without disclosure or documentation. In some tests, sensors were visibly misaligned, yet no post-repair validation was conducted to ensure system accuracy. In other cases, dashboard indicators suggested systems were ready, even when data logs revealed they were offline.
Ascential’s team, which provides technical research and testing services to manufacturers, insurers and government agencies, reports that even when shops possess the right scan tools, technicians often lack the training or procedural discipline to follow complete calibration protocols. Factors such as poor workshop lighting, unlevel floors and insufficient space for static calibration contribute to high failure rates, especially for systems relying on radar or stereo vision inputs.
In addition to testing vehicles across a range of common collision repairs, the whitepaper includes a synthesis of recent academic research and insurer case studies. The results show that ADAS features, while technically effective in controlled conditions, rarely achieve their full potential after real-world body or glass work. For example, forward-collision warning systems that reduce rear-end crashes by up to 50 percent in controlled tests see their effectiveness cut by more than half when sensor placement or software configuration is off-specification.
The whitepaper stresses that ADAS technology is not self-correcting and requires deliberate recalibration after any repair affecting sensors, camera housings, structural alignment or tire size.
Ascential warns that this culture gap — the assumption that ADAS will “just work” — is placing drivers at risk and creating legal exposure for shops. The report notes that repair invoices frequently fail to document whether calibration procedures were completed, or even whether the systems were verified as operational before vehicle return. In some jurisdictions, insurers have reimbursed claims involving ADAS-equipped vehicles that later crashed due to inactive safety features, triggering disputes over liability.
"Repair experts advise shops to remind insurers of the liability if a calibration is skipped to save money," Moretti wrote. "[No] insurer wants to be on the hook if a safety system fails and causes a subsequent crash."
While OEMs continue to release new models with an increasing number of safety features, the report finds that service guidance has not kept pace with shop-level practices. Ascential concludes that without serious investment in technician training, standardised calibration environments and validation routines, ADAS features will continue to underperform across the collision repair industry.
The paper calls on repair networks, equipment suppliers, and industry regulators to treat ADAS calibration as a fundamental safety issue. Among the recommendations are technician certification programs, dedicated calibration bays, improved scan tool integration and repair documentation standards that include calibration results as a matter of course.
