drunk driving ignition interlock mandate faces a technology gapA federal push to keep impaired drivers from starting future vehicles is moving toward a deadline that the technology may not be ready to meet.The 2021 Infrastructure Investment and Jobs Act ordered new vehicles to include advanced technology capable of preventing impaired driving, but the passive system envisioned by the mandate has not reached production-ready form.The core idea is straightforward: stop an impaired driver before the vehicle moves. However, the rule does not call for the same ignition interlock devices already used in many drunk-driving cases. Those systems typically rely on a breathalyzer and are installed after a legal or court order. The federal mandate instead calls for technology that can passively determine impairment, then prevent or limit vehicle operation without requiring the driver to blow into a device.AdvertisementAdvertisementPossible approaches include measuring alcohol concentration through the skin using a sensor at a normal driving touch point, analyzing in-cabin exhalations, or monitoring steering inputs and eye motion to detect drowsiness, distraction, or other impairment. Therefore, the mandate reaches beyond conventional drunk-driving enforcement equipment and into the broader territory already occupied by driver-monitoring systems, cabin sensors, and advanced safety software.The practical problem is reliability. The Alliance for Automotive Innovation has raised concern in Washington that even occasional false readings from an immature system could leave sober drivers unable to use their vehicles.That concern goes directly to the implementation challenge: a system designed to prevent deadly crashes would also need to avoid wrongly immobilizing drivers who are legally and safely able to operate a vehicle.Meanwhile, several lawmakers have pushed back against the directive. U.S. Rep. Thomas Massie, R-Ky., is one of the most vocal opponents. Earlier this year, the House voted down his amendment to defund the section of the infrastructure law that mandates the technology, and he has also cosponsored a bill to overturn the rule. Massie argues the required system would "infringe on civil liberties," and he has raised questions about what happens after a car decides its driver is unfit to drive.AdvertisementAdvertisementHowever, the final response mechanism has not been settled. NHTSA has not finalized a plan for what a vehicle would do after detecting impairment. The response could range from a warning to an intervention, and it could occur before the vehicle moves or while it is already in motion. In contrast with some criticism suggesting vehicles could summon law enforcement, the source states that NHTSA has not chosen such a plan.The timeline is also under pressure. Under the original Infrastructure Investment and Jobs Act schedule, automakers were due to fit vehicles with the required technology by the 2028 model year. There is a "near-zero chance" that ignition interlock-style systems will appear in 2028 vehicles. As a result, NHTSA will need to explain delays through an annual report, a requirement that remains in place for the 10 years following the law's enactment in November 2021.
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