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HR 6688

ADAS Functionality and Integrity Act

119th Congress Introduced by Diana Harshbarger and 5 co-sponsors

NHTSA would publish guidelines and set tolerances for ADAS and vehicle dynamics after 2028 modifications, plus require calibration, testing, and enforcement.

Subcommittee Consideration and Mark-up Session Held
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Bill Summary · HR 6688

Overview

  • Bill: HR 6688
  • Session: 119th Congress, 1st Session
  • Title: ADAS Functionality and Integrity Act
  • Purpose: Establish NHTSA guidelines to calibrate, modify, and set tolerances for Advanced Driver Assistance Systems (ADAS) and related vehicle dynamic systems, with processes for testing, verification, and enforcement.

Main goal

Require the Department of Transportation, through NHTSA, to develop and publish guidelines that ensure ADAS and vehicle dynamic systems remain functional when passenger vehicles are modified or customized for model year 2028 and later. The act also tasks a formal study to assess feasibility, safety needs, and costs of implementing these guidelines.

Key provisions

Section 2 — Guidelines for ADAS modification ranges and tolerances

  • Timeline: Guidelines to be published within 24 months after enactment.
  • Scope: Applies to ADAS and vehicle dynamic systems in passenger vehicles (model year 2028 and newer) when modified or customized.
  • Contents of guidelines:
    • (1) Define allowable modification ranges and tolerances for physical parameters affecting ADAS functionality (ride height, wheel/tire dimensions, overall geometry, displacement parameters, sensor/camera function).
    • (2) Establish a process for manufacturers to provide tolerance and system sensitivity information to owners and the Administrator within 30 days of vehicle release.
    • (3) Set quantifiable tolerance thresholds for changes in vertical and lateral displacement across all axes to maintain ADAS performance.
    • (4) Prescribe proper calibration procedures after repair, modification, or component replacement.
    • (5) Define confirmatory test protocols and performance metrics so owners, service providers, and independent repair facilities can verify ADAS integrity post-calibration.
  • Enforcement: Non-compliance could incur civil penalties under 49 U.S.C. 30165(a).

Section 3 — ADAS modification ranges and tolerances study

  • Timeline: Study due within 12 months of enactment.
  • Purpose: Assess safety needs, feasibility, capabilities, and costs for developing and maintaining guidelines.
  • Study topics (mirroring guideline content):
    • Vehicle tolerance and system sensitivity information for calibration after modification.
    • Allowable modification ranges and tolerances for physical parameters affecting ADAS and vehicle dynamics.
    • Quantifiable tolerance thresholds for axis displacement changes.
    • Calibration procedures following repair/modification/replacement.
    • Confirmatory test protocols and validation metrics.
  • Stakeholder outreach: Engage manufacturers, standard-setting bodies, independent aftermarket, and dealers.

Definitions (Section 4)

  • ADAS: Advanced Driver Assistance Systems in passenger vehicles (Levels 0–2 per SAE J3016).
  • Passenger motor vehicle: As defined by US law, includes most cars and light trucks under 10,000 lb GVWR.
  • Vehicle dynamic system: ADAS and related systems affecting stability, control, or motion.
  • Independent automotive aftermarket: Entities not authorized by manufacturers or affiliated service providers.
  • Confirmatory test: Standardized post-calibration vehicle test to validate performance.

Affected parties

  • Manufacturer and dealer networks: Must adhere to calibration, tolerance, and testing guidelines.
  • Vehicle owners: Gain clearer information and testing protocols to verify ADAS after modifications.
  • Independent repair facilities and the independent aftermarket: Provided with guidelines and testing protocols to verify ADAS integrity.
  • NHTSA and the Secretary of Transportation: Lead agency for guideline development, study, and enforcement.

Procedural and timeline notes

  • Guideline publication deadline: 24 months after enactment.
  • Study deadline: 12 months after enactment.
  • Guideline enforcement: Civil penalties for non-compliance under existing federal motor vehicle safety penalties.

Potential impact

  • Improves safety by ensuring ADAS remain effective after aftermarket modifications or repairs.
  • Creates standardized calibration, tolerance, and testing protocols that can be applied across manufacturers and service providers.
  • Enhances transparency for owners through documented tolerance information and standardized confirmatory testing.
  • Introduces potential compliance costs for manufacturers and service providers to implement guidelines and testing regimes.
  • Promotes collaboration among manufacturers, standard-setting bodies, the aftermarket, and dealers.

Compiled from official sources — confirm details with the bill’s official record.

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