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The Highway Performance Monitoring System. What is HPMS?. National highway transportation system database Data on highway conditions, performance, and usage Analytical products such as VMT estimation Primary source of information for distributing Federal-aid funds. What is HPMS?.

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Presentation Transcript
what is hpms
What is HPMS?
  • National highway transportation system database
  • Data on highway conditions, performance, and usage
  • Analytical products such as VMT estimation
  • Primary source of information for distributing Federal-aid funds
what is hpms1
What is HPMS?

Contains data on our Nation’s highways

  • Extent - mileage
  • Condition - IRI, PSR
  • Performance - traffic/pavement
  • Use - VMT
  • Operating Characteristics - V/C
scope of the hpms
Scope of The HPMS
  • A nationwide inventory system that includes data for allof the Nation\'s public road mileage
  • Annually certified by each State’s Governor
  • Includes facilities both on and off State-owned highway systems
  • Each State is required to furnish annually all data requirements specified in the HPMS Field Manual.
… any road or street owned and maintained by a public authority … open to public travel … available, except during scheduled periods, extreme weather or emergency conditions, passable by four-wheel standard passenger cars, and open to the general public for use without restrictive gates, prohibitive signs …

Public Road

who uses data from hpms
Who Uses Data from HPMS?
  • U.S. Department of Transportation(including)
    • Federal Highway Administration
    • Federal Transit Administration
    • National Highway Traffic Safety Administration (NHTSA)
  • Other Federal Agencies
    • Environmental Protection Agency (EPA)
    • Department of Defense (STRAHNET)
  • U.S. Congress
what do they use it for
What do they use it for?
  • Apportioning Federal Aid highway funds
  • Performance measures
    • pavement condition, congestion
  • Air quality analyses
  • Determine fatality and injury rates

“Status of the Nation’s Highways, Bridges, and Transit: Conditions & Performance”

    • Biennial Report to Congress
federal aid highway funding
Federal Aid Highway Funding
  • Interstate Maintenance Program 25%
  • National Highway System 30%
  • Surface Transportation Program 35%
  • Highway Safety Programs >5%
the hpms submittal
The HPMS “Submittal”

Due June 1:

  • Public Road Mileage Certification
      • Certified by the Governor of the State

Due June 15:

  • Summary Data & Estimates
  • Full Extent Data
  • Sample Panel Data
  • GIS Route System
statewide summary data
Statewide Summary Data

Information on travel, system length, pavement data, vehicle classification by functional system and area type, in addition to land area and population by area type.

NAAQS designations.

statewide summary data1
Statewide Summary Data
  • Manual entry of travel (VMT), population, land area for non-Federal Aid roads by Rural, Small Urban and each Large Urban
  • Paved/Unpaved mileage manually entered for non-Federal Aid Roads by Rural, Small Urban, and sum of Large Urban areas
  • Percentage of vehicles by 13 classifications manually entered for Federal Aid roads
estimates data
Estimates Data
  •  Last overlay thickness
  •  Thickness of rigid pavement
  •  Thickness of flexible pavement
  •  Base type
  •  Base thickness
  •  Binder Type
  •  Dowel bar presence
  •  Typical joint spacing
full extent data
Full Extent Data
  • Data items reported on all Federal Aid eligible roadways
  • Total mileage reported must match the Certified Public Road Mileage
full extent data1
Full Extent Data
  • Route – Number Signing & Qualifier
  • Functional Class, Urban Area
  • County
  • Number of Lanes
  • Ownership
  • Access Control, HOV, Toll
  • AADT, Truck AADT
  • IRI – NHS annually, Princ Art - biennially
sample panel data
Sample Panel Data
  • Peak lanes, turn lanes
  • Peak trucks, K-factor, d-factor
  • Intersections – stop signs, signal type, g/c
  • Terrain type, grades, curves
  • Lane widths, shoulder widths, median
  • Widening potential, passing sight distance
  • Pavement type and condition info
  • No more “donut” Samples
hpms standard samples
HPMS Standard Samples

Stratified “random” sample of

physical roadway sections

Stratified based on:

  • Rural / Small Urban / Urbanized
  • Functional Classification
  • Traffic Volume Groups
sample selection
Sample Selection
  • Originally fixed, focused on pavement
  • 1998 Reassessment
      • More flexible to account for variations and non-pavement data
  • Later
      • More “fluid” to focus more on traffic data
  • 2010 Reassessment
hpms samples
HPMS Samples
  • Sample Adequacy
  • Sample Management
traffic data vmt
Traffic Data & VMT

Traffic data (AADT) was only required in HPMS for Principal Arterials, NHS, and Samples

AADT is now required for all Federal Aid eligible roads (STP-based on FC, and NHS)

Must develop estimates for missing AADT counts

VMT estimation is now a straight calculation

data collection
Data Collection

Highway Performance

Monitoring System

publishing the hpms data
Publishing the HPMS data

Published format:

  • “Highway Statistics”
  • “Our Nation’s Highways

– Selected Facts & figures”


What is VMT?

  • VMT = Vehicle Miles of Travel

= AADT x segment length

  • It is an additive measure of cumulative travel

VMT Estimation

  • Can be calculated for State Systemwhere traffic counts are relatively comprehensive
  • Estimated for HPMS using Sample expansion (until Reassessment)
  • Stratified by Urban, Rural, Small Urban areas
hpms sample domains
HPMS Sample Domains

No. Samples

Rural: 406

Sm. Urban: 395


Glens Falls

























New York


hpms vmt estimation
HPMS VMT Estimation
  • Entire VMT estimation for Federal Aid roads has been based on Sample data (all other traffic counts ignored)
    • Will be changed to full calculation of Federal Aid VMT this year
  • Non-Federal Aid VMT (FC 08, 09, 19) based on adjustment of prior year VMT estimate
vmt accuracy
VMT Accuracy
  • Within HPMS, accuracy is affected by Sample “adequacy” and quality of “current year estimates” of AADT
  • Local VMT is more challenging given the difficulty of measuring both baseline traffic and growth
new approach to vmt hpms reassessment
New approach to VMT – HPMS Reassessment
  • Traffic counts “required” on all Federal Aid eligible roads
  • VMT estimation is straight calculation
    • No Sample “expansion”
  • Local VMT is still an off-line estimate
    • Local VMT typically not used in Fed Aid formulas
required traffic counts
“Required” Traffic Counts

Percent FA with counts

current year estimates
“Current” year estimates
  • Non-current counts adjusted to current year using “Matrix” process
    • 15 year table of actual traffic counts
    • Regression analysis to develop growth rates by Functional Class by Region
    • Rates applied to last actual counts
  • “Average” rate for 2009: 0.5-0.6%/yr
vmt old process vs new daily vmt on federal aid stp eligible roads
VMT– Old Process vs New Daily VMT on Federal Aid (STP) eligible roads

VMT Growth

Old rate: -0.2%

New rate: -1.6%

to reflect current growth
To reflect current growth:
  • Improve data collection rate options
    • Tighter control of contract schedules
    • Shorten traffic count cycles
  • Increase # stations counted annually
    • Set of short count stations, such as HPMS Sample approach
    • Increase number of continuous counter
cost implications
Cost implications
  • Requires additional staff for:
    • Count processing
    • Contractor liaison and administration
    • Payment request processing
impact of higher growth rate
Impact of higher growth rate
  • Matrix produced a 0.5 to 0.6% rate
  • Recalculated VMT in new 2009 HPMS file using a 1% growth rate
  • Result showed a 0.1% difference in total VMT using a 1% annual growth rate for all counts older than 2009
  • Conclusion: counts are sufficiently current to reflect recent trends in VMT total, but still may not give desired “annual” picture