00227861

Component

http://onlinepubs.trb.org.../hrbbulletin/76/76-002.pdf

A PROJECT WAS CONDUCTED IN IOWA TO: (1) ASSEMBLE ORIGIN- AND-DESTINATION INFORMATION USEFUL TO THE HIGHWAY COMMISSION, IOWA STATE COLLEGE, AND THE CITY OF AMES, IN CONNECTION WITH THEIR ORDINARY TRAFFIC HANDLING AND TRANSPORTATION PLANNING, (2) COLLECT FIELD DATA BY WHICH RESEARCH COULD BE CONDUCTED ON THE IMPROVEMENT OF METHODS OF MAKING ORIGIN-AND-DESTINATION STUDIES OF TRAFFIC, AND (3) COMPARE THE FIELD POSTCARD METHOD OF GETTING ORIGINS AND DESTINATIONS WITH THE ROADSIDE-INTERVIEW METHOD. TRAFFIC- VOLUME COUNTS WERE TAKE DAILY BY HOURS WITH TRAFFIC RECORDERS BY THE HIGHWAY COMMISSION FROM SEPTEMBER 27 THROUGH NOVEMBER 13. A FIELD PARTY OF SIX PERSONS PASSED OUT POSTCARDS. THE ROADSIDE-INTERVIEW PHASE WAS CONDUCTED BY THE SAME FIELD PARTIES, PLUS ADDITIONAL PERSONNEL. FROM THE RESULTS OF THE STUDY OF THE FIELD POSTCARD METHOD, THERE IS EVIDENCE THAT THE EXPANSION FACTORS SHOULD BE CAREFULLY DETERMINED, PREFERABLY BY CLASSES OF VEHICLES, REGISTRATION PLATE, AND BY HOURS OF THE DAY. A WIDE VARIATION OF EXPANSION FACTORS WAS DEVELOPED FOR THE VARIOUS ORIGIN-AND- DESTINATION-TRIP GROUPS WITHOUT SUFFICIENT CONSISTENCY BETWEEN THE EXPANSION FACTOR AND THE GEOGRAPHICAL LOCATION. TRIPS FROM ONE STATE ACROSS IOWA TO ANOTHER STATE RESULTED IN HIGHER EXPANSION FACTORS THAN DID OTHER TYPES OF TRIPS. CORRECT FACTORS COULD BE ANTICIPATED AND ASSUMED AHEAD OF KNOWING THE TRUE DISTRIBUTION OF THE TRIPS. IT IS CONCLUDED THAT THERE IS NO MEANS AVAILABLE OF CHECKING THE CORRECTNESS OF THE EXPANDED RETURNS FROM THE POSTCARD SURVEY, ONCE THEY ARE EXPANDED TO TRIPS BETWEEN SPECIFIC ORIGINS AND DESTINATIONS. IT APPEARS THAT ROADSIDE INTERVIEWS SHOULD BE CONDUCTED IN ADDITION TO THE POSTCARD SURVEY TO GET A BASIS OF EVALUATION OF THE RELIABILITY OF THE POSTCARD RETURNS.

No 76, pp 10-30, 42 FIG, 7 TAB 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

01410489

English

1953

Highway Research Board Bulletin

Alternatives analysis; Field studies; Interviewing; Origin and destination; Registrations; Traffic surveys; Traffic volume; Vehicles

Field data

Highways; Operations and Traffic Management; Vehicles and Equipment

TRIS, TRB

Aug 15 2004 2:36AM

• DALLAS TRAFFIC-SURVEY METHODS AND COST ANALYSIS
• SAMPLING METHODS FOR ROADSIDE INTERVIEWING
• SAMPLING PROCEDURES FOR ROADSIDE INTERVIEWS IN ORIGIN-AND- DESTINATION TRAFFIC SURVEYS