00495001

Component

http://onlinepubs.trb.org...trr/1989/1236/1236-001.pdf

https://scholar.google.co...mott&publication_year=1989

This paper covers a detailed examination of the adequacy of the Highway Performance Monitoring System (HPMS) sample for making needs estimates at the district level in Texas and recommends increases in the current sample based on the results of the examination. To test the accuracy of sample sizes, a simulation model was developed to calculate the errors of a given sample size. Since the FHWA procedure uses average annual daily traffic (AADT) to calculate the required sample size, the simulation model was used to compare the accuracy of needs estimates with the assumed accuracy using AADT. It was found that in general, the errors were larger than the assumed error range at the functional class level, but the errors decreased substantially as functional classes were aggregated. The simulation model was also used to test the usefulness of stratifying the functional classes by volume group. It was found that in most cases stratifying did improve the accuracy of the sample estimates. Further, it was found that in most cases calculating the sample at the functional class level and distributing the sample to volume groups proportionately by mileage performed better than calculating the sample at the volume group level.

This paper appears in Transportation Research Record No. 1236, Transportation Data 1989. 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

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p. 1-8

1989

Transportation Research Record

030904958X

Figures (11) ; References (9) ; Tables (2)

Accuracy; Alternatives analysis; Annual average daily traffic; Errors; Estimates; Needs assessment; Simulation; Statistical sampling

Highway performance monitoring system; Sample size

Data and Information Technology; Highways; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Jun 30 1990 12:00AM

• DESIGN AND IMPLEMENTATION OF INTERCITY ORIGIN-DESTINATION SURVEYS
• DEVELOPMENT OF STATE TRAFFIC MONITORING STANDARDS: IMPLEMENTING "TRAFFIC MONITORING GUIDE" IN NEW MEXICO
• GEOGRAPHIC INFORMATION SYSTEMS: AN IMPORTANT TECHNOLOGY FOR TRANSPORTATION PLANNING AND OPERATIONS
• METHOD TO SYNTHESIZE A FULL MATRIX OF INTERDISTRICT HIGHWAY TRAVEL TIMES FROM CENSUS JOURNEY-TO-WORK DATA
• ON-LINE GENERATION OF SYNTHETIC ORIGIN-DESTINATION COUNTS FOR APPLICATION IN FREEWAY CORRIDOR TRAFFIC CONTROL
• OPTIMAL DESIGN OF TRAFFIC COUNTS
• RECURSIVE MODEL SYSTEM FOR TRIP GENERATION AND TRIP CHAINING