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Title: IMPROVED SAMPLING TECHNIQUES TO DETERMINE TRIP CHARACTERISTICS FOR TRAFFIC IMPACT ANALYSES
Accession Number: 00638777
Record Type: Component
Availability: Find a library where document is available Abstract: The development of sampling and surveying methodologies for statistically reliable trip characteristic surveys of land developments was researched. The two goals of the sampling methodology research were to (a) determine the effect of a monetary incentive on questionnaire response rates and (b) estimate the coefficients of variation of primary and diverted trip types and hence suggest a statistically based sample size guideline for a particular type of land development--a community-scale shopping center. The final part of the survey methodology research was to examine bias potential in land development surveys. On the basis of the finding that current sampling and surveying methods were inadequate to determine statistically reliable trip characteristics for some land developments, a hybrid prototype survey technique was designed and tested. Reduction and analysis of the test survey data revealed important findings. First, the monetary inducement of $1.00 increased the survey questionnaire response rate nearly threefold, from 11% to nearly 30%. Thus, sampling error at a given confidence level can be reduced. Second, the coefficients of variation of trip lengths varied substantially on an hourly basis, with the total day averages estimated at 0.8 and 1.6 for primary and diverted trip types, respectively. With minor verification these can be used as transferrable parameters for conducting statistically reliable surveys at other locations. And third, a test was conducted for potential intrasite sampling location bias. The test was designed to detect bias potential without affecting the data; the potential for bias was detected. The research underscores the need for establishing appropriate sampling techniques as developed in this research.
Supplemental Notes: This paper appears in Transportation Research Record No. 1400, Planning and Programming, Land Use, Public Participation, and Computer Technology in Transportation. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
Monograph Title: Planning and programming, land use, public participation, and computer technology in transportation Monograph Accession #: 01403242
Language: English
Authors: Landis, Bruce WPagination: p. 78-81
Publication Date: 1993
Serial: ISBN: 0309054702
Features: Figures
(1)
; References
(13)
; Tables
(1)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Data and Information Technology; Highways; Planning and Forecasting; I72: Traffic and Transport Planning
Files: TRIS, TRB
Created Date: Nov 10 1993 12:00AM
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