Estimating free-flow speeds for rural multilane highways

Karen K. Dixon, Chi Hung Wu, Wayne Sarasua, Janice Daniel

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The National Highway System Designation Act of 1995 repealed the national maximum speed limit. As a result, many of the states have increased posted speed limits to 105 km/h (65 mph) for select multilane highways. This study evaluates the distribution of the speed and studies the influence of site characteristics, light conditions, and type of vehicle on the field-measured free-flow speed. The suitability of the Highway Capacity Manual multilane highway rules of thumb for free-flow speed to both an 89- and a 105-km/h (55- and 65-mph) posted speed limit condition is also discussed.

Original languageEnglish (US)
Pages (from-to)73-82
Number of pages10
JournalTransportation Research Record
Issue number1678
StatePublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Mechanical Engineering


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