July 22


The fourth volume of the 2010 Highway Capacity Manual is a living document online at http://hcm2010.org.  If you don't want to spend $275 on the 2010 HCM, but still want to poke around the fourth volume, go to http://hcm2010.org/login and use my info –

  • Email:  mspack@spackconsulting.com
  • Password:  CountingCars.com

We've been shutdown by the man!  I solemnly pledge I won't broadcast the new login/password they're giving me.  If you'd like to discuss this policy of TRB's please email me at mspack@trafficdatainc.com.

On a side note, I sat in on the HCM 2010 Webinar yesterday titled Enhanced Planning Methods and Applicaiton of Generalized Service Volume Tables.  No major revelations to report back on.  Basically, this section of the Manual gives methods for doing quick calculations to figure out a roadway's general capacity. 

It would be great if each section/chapter in the Institute of Transportation Engineers would do these calculations for their region as a recommended guideline.  This would allow us to say a 2 lane road in Raleigh, NC has a rough capacity of xx,xxx cars per day instead of every traffic engineer doing their own calculations.  Of course traffic engineers could do more refined analyses if they think they're justified, but it would nice to have consistent levels as a starting point for each region of the country.

  • LOL I saw that coming when you first said you would make your login available.
    Locally (Dallas-Fort Worth) the NCTCOG has defined some hourly service volumes for various road classifications, in 5 different area types. They do it for their regional modelling efforts, but the table has become the de facto capacity thresholds for link analyses in this area, using some LOS ranges based on V/C. Daily capacity is defined as 10x the hourly capacity, which always bugs me, as it becomes more of a “quality of life” measure than technical capacity.

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    Mike Spack

    My mission is to help traffic engineers, transportation planners, and other transportation professionals improve our world.

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