I 
119TH CONGRESS 
1ST SESSION H. R. 6688 
To require the National Highway Traffic Safety Administration to establish 
guidelines for advanced driver assistance systems calibration, modifica-
tions, and tolerances, and for other purposes. 
IN THE HOUSE OF REPRESENTATIVES 
DECEMBER 12, 2025 
Mrs. HARSHBARGER (for herself, Mr. OBERNOLTE, Mr. VASQUEZ, and Mrs. 
TORRES of California) introduced the following bill; which was referred 
to the Committee on Energy and Commerce 
A BILL 
To require the National Highway Traffic Safety Administra-
tion to establish guidelines for advanced driver assistance 
systems calibration, modifications, and tolerances, and 
for other purposes. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘ADAS Functionality 
and Integrity Act’’. 
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SEC. 2. ADAS MODIFICATION RANGES AND TOLERANCES 
GUIDELINES. 
(a) GUIDELINES FOR ADAS.—Not later than 24 
months after the date of the enactment of this Act, the 
Secretary of Transportation, acting through the Adminis-
trator of the National Highway Traffic Safety Administra-
tion, in consultation with manufacturers of passenger 
motor vehicles and equipment, standard settings organiza-
tions, the independent automotive aftermarket, and deal-
ers, shall develop and publish guidelines to ensure ADAS 
and vehicle dynamic systems installed in any passenger 
motor vehicle, for a model year on and after 2028 main-
tains functionality when a passenger motor vehicle is 
modified or customized that include the following: 
(1) Allowable modification ranges and toler-
ances, including physical parameters impacting 
ADAS and vehicle dynamic systems functionality, in-
cluding ride height, wheel and tire dimensions, over-
all static geometry, physical displacement param-
eters, and sensor and camera function. 
(2) A process for manufacturers to provide ve-
hicle tolerance and system sensitivity information 
relevant to modification and calibration to owners 
and the Administrator within 30 days after the re-
lease of a passenger motor vehicle. 
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(3) 
Quantifiable 
tolerance 
thresholds 
for 
changes in vertical and lateral displacement, in all 
axes, 
necessary 
to 
maintain 
proper 
ADAS 
functionality. 
(4) Proper calibration procedures of ADAS and 
other vehicle dynamic systems following repair, 
modification, or component replacement. 
(5) Confirmatory test protocols and perform-
ance validation metrics that allow owners, service 
providers, and independent repair facilities to verify 
the operational integrity of ADAS after calibration. 
(b) CONTRACTING AUTHORITY.—The Administrator 
may contract with independent laboratories and vehicle 
testing facilities to carry out any testing that may be re-
quired to develop the guidelines under subsection (a). 
(c) REQUIREMENT TO USE EMPIRICAL DATA.—Any 
determination made by the Administrator in issuing the 
guidelines required pursuant to subsection (a) shall be 
based on empirical data derived from dynamic testing, 
independent research, and public data sources. 
(d) USE OF NCAP METHODOLOGIES.—The guide-
lines described in subsection (a)(4) shall reference or ex-
pand upon methodologies established by the United States 
New Car Assessment Program, including— 
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(1) a standardized scoring scale to evaluate the 
effectiveness of calibration (such as good, fair, and 
poor); and 
(2) transparent validation criteria that can be 
applied across vehicle platforms and assessed over 
the lifecycle of the vehicle. 
(e) ENFORCEMENT.—A manufacturer of a passenger 
motor vehicle or equipment that does not meet the guide-
lines issued pursuant to this section is subject to the civil 
penalties described under section 30165(a) of title 49, 
United States Code. 
SEC. 3. ADAS MODIFICATION RANGES AND TOLERANCES 
STUDY. 
(a) STUDY REQUIRED.—Not later than 12 months 
after the date of the enactment of this Act, the Secretary 
of Transportation, acting through the Administrator of 
the National Highway Traffic Safety Administration, shall 
complete a study and submit to Congress a report that 
assesses the safety needs, feasibility, capability, and cost 
to the National Highway Traffic Safety Administration to 
develop and maintain industry guidelines to support the 
functionality of ADAS and vehicle dynamic systems in-
stalled in passenger motor vehicles for a model year on 
and after 2028 after a passenger motor vehicle is modified 
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or customized. The study shall consider the development 
of industry guidelines relating to the following: 
(1) Vehicle tolerance and system sensitivity in-
formation relevant to calibration following modifica-
tion. 
(2) Allowable modification ranges and toler-
ances for passenger motor vehicles, including phys-
ical parameters that impact ADAS and vehicle dy-
namic systems functionality, including ride height, 
wheel and tire dimensions, overall static geometry, 
physical displacement parameters, and sensor and 
camera function. 
(3) 
Quantifiable 
tolerance 
thresholds 
for 
changes in vertical, longitudinal, and lateral dis-
placement, in all axes, necessary to maintain proper 
ADAS functionality. 
(4) Proper calibration procedures of ADAS and 
other vehicle dynamic systems following repair, 
modification, or component replacement. 
(5) Confirmatory test protocols and perform-
ance validation metrics that allow owners, service 
providers, and independent repair facilities to verify 
the operational integrity of ADAS after calibration. 
(b) STAKEHOLDER OUTREACH.—In carrying out the 
study required under subsection (a), the Administrator 
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shall consult with manufacturers of passenger motor vehi-
cles and equipment, standard setting organizations, the 
independent automotive aftermarket, and dealers. 
SEC. 4. DEFINITIONS. 
In this Act: 
(1) ADMINISTRATOR.—The term ‘‘Adminis-
trator’’ means the Administrator of the National 
Highway Traffic Safety Administration. 
(2) ADVANCED DRIVER ASSISTANCE SYSTEMS; 
ADAS.—The term ‘‘advanced driver assistance sys-
tem’’ or ‘‘ADAS’’ means a passenger motor vehicle 
equipped with a Level 0, Level 1 or Level 2 system. 
(3) DEALER; 
MANUFACTURER.—The terms 
‘‘dealer’’ and ‘‘manufacturer’’ have the meaning 
given those terms in section 30102 of title 49, 
United States Code. 
(4) CONFIRMATORY TEST.—The term ‘‘confirm-
atory test’’ means a standardized post-calibration ve-
hicle test designed to validate system performance. 
(5) 
INDEPENDENT
AUTOMOTIVE 
AFTERMARKET.—The term ‘‘independent automotive 
aftermarket’’ means any party or entity not author-
ized by a passenger motor vehicle manufacturer or 
affiliated service provider. 
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(6) LEVEL 0; LEVEL 1; LEVEL 2.—The terms 
‘‘Level 0’’, ‘‘Level 1’’, and ‘‘Level 2’’ have the mean-
ing given those terms in the April 2021 edition of 
the J3016 recommended practice of SAE Inter-
national, ‘‘Taxonomy and Definitions for Terms Re-
lated to Driving Automation Systems for On-Road 
Motor Vehicles’’, or any subsequent edition of J3016 
adopted by the Secretary. 
(7) MOTOR VEHICLE.—The term ‘‘motor vehi-
cle’’ has the meaning given that term in section 
32101 of title 49, United States Code. 
(8) OWNER.—The term ‘‘owner’’ has the mean-
ing given that term in section 30106(d)(2) of title 
49, United States Code. 
(9) PASSENGER
MOTOR
VEHICLE.—The term 
‘‘passenger motor vehicle’’ has the meaning given 
that term in section 32101 of title 49, United States 
Code, including a motor vehicle with a gross vehicle 
weight rating of less than 10,000 pounds. 
(10) 
SECRETARY.—The 
term 
‘‘Secretary’’ 
means the Secretary of Transportation. 
(11) VEHICLE
DYNAMIC
SYSTEM.—The term 
‘‘vehicle dynamic system’’ means ADAS and any re-
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