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Status of TMIP Peer Reviews - Iowa Department of Transportation (IaDOT)

Standard Rates and Values for Modeling - Presentation

Trip Generation

Trip Purpose

Purpose Triangle Survey* Triad Survey* Charlotte Region* National
HBW 22% 20% 19% 18 - 25%
HBO 46% 49%   47 - 58%
NHB 32% 31%   18 - 28%
Non-HBW     81%  

*Incorporates urban and non-urban households

Vehicle Trip Production Rates

Housing Classification 1995 Triangle Household Survey Triad Survey National Data [FHWA]
Excellent 9.4* 9.3 11.2
Above Average 9.4* 9.1 11.2
Average 8.3 7.7 8.3
Below Average 6.2* 6.3 5.4
Poor 6.2* 5.7 5.4
All Dwelling Units 7.8 7.4 - 8.0 7.8

*Categories had to be combined to achieve a statistically significant sample

Validation of Production Rates

Vehicle Trip Attraction Rates*

Employment Type HBW HBO NHB IX
Industry 1.2 0.63 1.1 0.34
Retail 1.2 3.4 1.0 0.49
Highway Retail 1.2 4.2 4.0 0.28
Office 1.2 1.2 1.1 0.28
Service 1.2 2.0 1.9 0.28
Dwelling Units 0 0.9 0.13 0.33

*Rates obtained from 1995 Triangle Household Survey

Validation of Attraction Rates

Validation of NHB Trips Made by Non-Residents (NHB secondary trips)

Balancing Productions and Attractions

Updated: 03/28/2014
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