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Systems Planning Office
Ed Hutchinson, Manager
850-414-4900




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FDOT Systems Planning Office - Highway Capacity/Level of Service

Page Contents


Schedule for Implementing HCM 2010


 

Significant Changes from the 2000 HCM to 2010 HCM

  • Multimodal

    • The 2010 HCM encourages users to consider all modes of travel on a facility when performing analyses and making decisions. The new approach will focus on traveler perspective and evaluate the trade-offs between modes

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    • The Urban Streets chapter within the Interrupted Flow portion of the HCM delivers a multimodal evaluation including how the presence of one mode affects other modes. The service measures for automobile, pedestrian, bicycle, and transit performance are included.

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  • Arterial Classes

    • In the 2000 version of the HCM there were 4 identified arterial classes. These classes were differentiated largely by signal density and posted speed limits. The 2010 HCM no longer differentiates arterials by class, ultimately categorizing all arterials into one class.

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    • The Department is actively conducting research on arterial classes to determine the best way to evaluate arterials into the future. Conceptually, a suburban arterial with signal density of 2 per mile and a posted speed limit of 50 mph does not have the same attributes as an arterial in a central business district with a posted speed limit of 30 mph and 5 signals per mile.

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Recommended Practice

On the State Highway System the following analysis techniques described in the Q/LOS Handbook will be used in lieu of the techniques in the HCM/HCS or other related methodologies:

  • Generalized service volume tables – The HCM service volume tables are generic, Florida’s general service volume tables more accurately reflect condition in the state.

  • Freeway facility capacities – Florida traffic statistics indicate capacities more in line with values shown on page 108 of FDOT’s Quality/Level of Service Handbook than what is routinely calculated with HCS. If HCS capacity calculations are higher than those on page 108, they should be lowered to match the values on page 108.
  • Rural freeway level of service criteria – Research in Florida indicates different level of service thresholds than those appearing in the 2010 HCM.
  • Arterial facility level of service criteria – Florida and the HCM have traditionally employed a class system when evaluating arterials. The HCM no longer differentiates between arterial classes, Florida research indicates a need to proceed with an arterial classification system.
  • Arterial free flow speed determinations – The 2010 HCM free flow speed for relatively high speed arterials is too low.
  • Passing lanes on two-lane highways – Within the HCM methodology, the presence of a passing lane on a two lane highway disproportionately increases the LOS on the facility.

 

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For further information on this topic contact:

Tyrone Scorsone
Systems Planning Office, Mail Station 19
Florida Department of Transportation
605 Suwannee Street
Tallahassee, Florida 32399-0450
Telephone:  (850) 414-4755
Fax:  (850) 414-4876
 

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