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Policy Information

Highway Statistics 2007

2008 Apportionment Formulas - Federal-Aid Highway Program Enacted in SAFETEA-LU

October 2008
Table FA4A

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FUND FACTORS WEIGHT STATUTE 1/ MINIMUM APPORTIONMENT
Interstate Maintenance (IM) Interstate System lane miles 33 1/3% 104(b)(4) 1/2 percent of Interstate Maintenance and National Highway System apportionments combined
  Vehicle miles traveled on the Interstate System 33 1/3%  
  Annual contributions to the Highway Account of the Highway Trust Fund attributable to commercial vehicles 33 1/3%  
National Highway System (NHS) Remainder apportioned as follows:   104(b)(1) 1/2 percent of Interstate Maintenance and National Highway System apportionments combined
   Lane miles on principal arterial routes (excluding the Interstate System) 25%  
   Vehicle miles traveled on principal arterial routes (excluding the Interstate System) 35%  
   Diesel fuel used on highways 30%  
   Total lane miles on principal arterials divided by the State's total population 10%  
Surface Transportation Program (STP) Total lane miles of Federal-aid highways 25% 104(b)(3) 1/2 percent
  Total vehicle miles traveled on Federal-aid highways 40%    
  Estimated tax payments attributable to highway users paid into the Highway 35%    
  Account of the Highway Trust Fund      
Bridge Replacement and Rehabilitation Program (BRR) Relative share of total cost to repair or replace deficient bridges 100% 144(e) 1/4 percent (10 percent maximum)
Congestion Mitigation and Air Quality Improvement Program (CMAQ) Weighted nonattainment and maintenance area population 100% 104(b)(2) 1/2 percent
Recreational Trails Program (RT) Equal shares to each eligible State 50% 104(h) None
Nonhighway recreational fuel use during the preceding year 50%    
Metropolitan Planning (MP) Urbanized area population 2/ 100% 104(f)(2) 1/2 percent
Minimum Guarantee Specific share specified in law of the aggregate apportionments for Interstate Maintenance, National Highway System, Bridge, Congestion Mitigation, Surface Transportation Program, Metropolitan Planning, Recreational Trails, Appalachian Development Highway System, and Minimum Guarantee and allocations for High Priority Projects adjusted to ensure that each State's share of apportionments for the specified programs is at least 91.5 percent of its percentage contributions tother Highway Account of the Highway Trust Fund. The shares specified in law are increased for States falling below the 91.5 level and the shares of the remaining States are decreased so that the shares continue to total 100 percent. 100% 105 $1 million
State and Community Highway Safety Grants Total population 75% 402(c) 1/2 percent, 1/4 percent for American
  Public road mileage 25%   Samoa, Guam, Virgin Islands, and the Commonwealth of the Northern Mariana Islands, 3/4 percent for Secretary of the Interior (Bureau of Indian Affairs)

1/ Denotes appropriate section in title 23 U.S. Code.

2/ Usually places of 50,000 or more persons. Definition contained in 23 U.S.C. 101(a).

Updated: 01/03/2012

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United States Department of Transportation - Federal Highway Administration