A Better Methodology for Trip Generation Internal Capture Rates

The Florida DOT hired the Center for Urban Transportation Research (CUTR) at the University of Florida in Tampa to analyze internal capture rates at nine mixed use site in Florida.  Brian Bochner of the Texas Transportation Institute was a sub-consultant on the project to help ensure consistency with the previous major analysis of internal capture rates – NCHRP Report 684.

They documented how much traffic is generated by each development (a very large data collection effort).  Then they used the NCHRP Report 684 methodology and ITE Trip Generation Manual methodology to forecast how much traffic is expected to be generated by each development.  Here are the results –

Internal Capture

The NCHRP Report 684 methodology was significantly more accurate than the ITE methodologies.  The ITE methodologies overestimated how much traffic would be generated in/out of a mixed use development.

If you forecast traffic, you should check out the full report – FDOT-BDK84-977-10-rpt.  Overall, they found ITE Trip Generation Manual based traffic forecasts for mixed use developments should be discounted 13-16% in the p.m. peak hour and 9-14% in the a.m. peak hour.

The report describes the study methodology in detail and makes several recommendations.  The following finding made me think of the usefulness of camera systems like the Miovision Scout or the COUNTcam

Performing door counts at as many establishments as possible allows the capture of activity data at the site. This gives more flexibility on data analysis, since the survey data can be expanded to the entire MXD based on activity levels in the trip factoring step.

This is a great addition to the literature and is very useful for our profession.  I wish they would have also compared the US EPA Mixed Use Trip Generation Methodology.  Maybe there’s a grad student out there that wants to dive into the dataset for their thesis.

(Hat tip – Karen Seggerman, CUTR-USF)

 

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3 thoughts on “A Better Methodology for Trip Generation Internal Capture Rates

  1. It is great to see our study posted in your blog. Thank you very much for summarizing the salient points and making suggestions for further work. This FDOT research project entitled “Trip Internalization in Multi-Use Developments” was conducted by the Center for Urban Transportation Research (CUTR) at the University of South Florida in conjunction with the Texas Transportation Institute. In your blog, you mentioned “The Florida DOT hired the Texas Transportation Institute to analyze internal capture rates at nine mixed use site in Florida.” The Florida DOT awarded the Center for Urban transportation Research at the University of South Florida to condcuct this research. For those 9 sites mentioned in the blog, six sites are located in Florida, two sites are in Texas and one site is in Georgia. Please make corrections. Thank you very much!

  2. Thank you for your blog summarizing the salient points and making suggestions for further work of our study. Please make two corrections. The Florida DOT awarded the Center for Urban Transportation Research (CUTR) at the University of South Florida in conjunction with the Texas Transportation Institute (TTI) to conduct this research. For those nine sites mentioned in internal capture rate analysis, six sites are located in Florida, two in Texas and one in Georgia. Thank you very much!

  3. We’ve been using this base data for several years…Or should I say have been trying to use this base data for several years. There are several other FDOT funded studies that also show alternative internals capture rates. Unfortuantely, the county and local government agencies refuse to accept them… Sad really.