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Software History

YEAR 2013

  • HERS-ST v5 (released November 2013)

YEAR 2011

  • HERS-ST v4.5 (released June 2011)
    • Debugged version of HERS-ST v4.4

YEAR 2009

  • HERS-ST v4.4 (released July 2009)
    • Debugged version of HERS-ST v4.3

YEAR 2007

  • HERS-ST v4.3 (released May 2007)
    • Debugged version of HERS-ST v4.2
  • HERS-ST v4.2 (released March 2007)
    • Debugged version of HERS-ST v4.0 & v4.1 (a software bug in v4.0 that was undetected, remained in v4.1...hence the release of v4.2)
  • HERS-ST v4.1 (released January 2007)
    • Debugged version of HERS-ST v4.0
    • Enhanced GIS features, including the ability to copy and paste maps directly into other software such as Word and PowerPoint.

YEAR 2006

  • National HERS-ST Technical Conference - June, 2006 - San Antonio, Texas
  • HERS-ST v4.0 (released June 2006) - New/revised/enhanced features:
    1. Pavement Model
      • Revised pavement deterioration model based on 1993 AASHTO Design Guide
      • Pavement deterioration rate adjustment factors by functional class and pavement type
      • ESAL Factors can be set by user
    2. Improvement Costs
      • Revised values based on new data
      • Disaggregated by urbanized area size and functional class
      • Rural Areas by functional class and terrain type
      • State cost factors eliminated
      • Local cost factors added to highway data
      • Price inputs converted to 2004$
    3. Capacity
      • New procedures based on Highway Capacity Manual 2000
      • Changes in calculation of capacity increases
      • Top widening feasibility code is "3 or more"
      • New user inputs for maximum number of normal cost lanes by FC*
      • Additional widening options
        • ½ Design number of lanes
        • ¾ Design number of lanes
        • Design number of lanes + 2
    4. Output
      • VMT disaggregated: 4-tire vehicles, single unit trucks, combination trucks
      • Vehicle hours traveled
    5. Intermediate Year Option
      • Allows user to specify intermediate year AADT forecast
      • Additional forecast year (change in trend)
      • Before/after traffic volumes in intermediate year
      • Implemented through a separate input file
    6. Other Changes
      • Four user-defined fields added to highway data
      • Constrained funding runs - two choices:
        1. "Borrow" from next funding period to implement one more improvement
        2. "Save" unused funds for use in next funding period

YEAR 2005

  • HERS-ST v3.2 (released June 2005)
    • Debugged version of HERS-ST v3.1

YEAR 2004

  • HERS-ST v3.1 (released November 2004)
    • Debugged version of HERS-ST v3.0
  • National HERS-ST Technical Conference - August, 2004 - Chicago, Illinois
  • HERS-ST v3.0 (released June 2004)
    • Updated graphical user interface (more user friendly)
    • Updated and enhance analytical engine

YEAR 2002

  • National HERS-ST Technical Conference - September, 2002 - Charlotte, North Carolina
  • HERS-ST v2.0 (released September 2002)
    • New graphical user interface
    • New improvement options for state users

YEAR 1999

  • HERS-ST Pilot Program - New Orleans, Louisiana (17 States involved)

YEAR 1997

  • Oregon and Indiana Departments of Transportation show interest in a State version of HERS

YEAR 1995

  • HERS is used for the first time to develop scenarios for the 1995 Conditions & Performance Report

YEAR 1994

  • Executive Order 12893 directs that Federal Infrastructure investments be selected on the basis of a systematic analysis of expected benefits and costs

YEAR 1987

  • Begin research and development of Highway Economic Requirements System (HERS) model

YEAR 1983

  • Establishment of HPMS Analytical Process (AP), which evaluated the impact of alternative investments strategies on system conditions and performance based on engineering principles

YEAR 1970's

  • Creation of a comprehensive database, the Highway Pavement Monitoring System (HPMS)

YEAR 1968

  • Beginning of the "National Highway Needs Report to Congress" (combined "wish list" and state highway "needs")
Updated: 02/12/2014