AASHTO Guidelines for Traffic Data Programs - Table of Contents

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TABLE OF CONTENTS Appendix C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 Literature Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 Appendix D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 Defi nitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3 LIST OF TABLES 1-1 Comparison of TMG to Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7 2-1 Examples of Highway Traffi c Data Uses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4 2-2 Examples of Customer Needs for Traffi c Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5 2-3 Sample Performance Measures by Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10 3-1 Vehicle Classifi cation Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34 3-2 Comparison of WIM Technologies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-42 4-1 Excerpt from a VDOT Contracting Agreement for Traffi c Data Collection and Equipment Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7 4-2 Defi nitions for Traffi c Data Quality Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11 4-3 Recommended Minimum Validation Criteria for Traffi c Data . . . . . . . . . . . . . . . . .4-18 4-4 VDOT Traffi c Data Quality-Level Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-32 4-5 Gross Vehicle Weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-35 5-1 Load Ranges Used for Load Spectra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6 5-2 Development of Axle-Correction Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14 5-3 Development of Growth Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17 5-4 Development of Time-of-Day Traffi c Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-21 6-1 Categories of Traffi c Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-14 6-2 Users’ Traffi c Data Needs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15 6-3 Standard/Nonstandard AVMT Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-19 6-4 Rounding Convention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-25 6-5 Traffi c Data Retention Periods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-29 6-6 Hourly Percent of Daily Traffi c by Month—MAWDT . . . . . . . . . . . . . . . . . . . . . .6-33 6-7 Hourly Percent of Daily Traffi c by Month—MAWET. . . . . . . . . . . . . . . . . . . . . . .6-34 7-1 Questions to Better Understand Archived Operations Data. . . . . . . . . . . . . . . . . . . .7-8 7-2 Recommended Additional Validation Criteria for Archived Data . . . . . . . . . . . . . .7-11 7-3 Hourly Traffi c Volume Format (#3 Record) from Traffi c Monitoring Guide . . . . .7-17 A-1 Basic Validation Criteria for Traffi c Counts from a State DOT . . . . . . . . . . . . . . . . A-1 A-2 Validation Criteria from Commercial Traffi c Data Software. . . . . . . . . . . . . . . . . . . A-2 A-3 Validation Criteria from the Traffi c Data Edit Procedures Pooled-Fund Study. . . A-5 LIST OF FIGURES 1-1 Summary of Traffi c Data Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 2-1 Example of Count Nesting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14 3-1 Illustrations of FHWA’s 13-Category Vehicle Classifi cation System . . . . . . . . . . . .3-15 GUIDELINES FOR TRAFFIC DATA PROGRAMS xi © 2009 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
TABLE OF CONTENTS 3-2 Picture of a Trailer-Mounted, Non-Intrusive Traffi c Volume Counter . . . . . . . . . .3-29 3-3 Example of a Pole-Mounted, Non-Intrusive Traffi c Volume Counter . . . . . . . . . . .3-30 3-4 Common Sensor Layout for a Permanent Axle-Based Vehicle Classifi er . . . . . . . .3-39 3-5 Sketch of 3M Microloop Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-57 4-1 Missing Data Patterns in Archived Operations Data from Austin, Texas Percent Complete for Hourly Volume Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29 4-2 WIM Quality Assessment Example 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-33 4-3 WIM Quality Assessment Example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-34 4-4 WIM Quality Assessment Example 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-34 4-5 WIM Quality Assessment Example 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-35 4-6 WIM Quality Assessment Example 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-36 4-7 WIM Quality Assessment Example 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-37 6-1 Hourly Traffi c by Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12 6-2 Diurnal Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-21 6-3 Monthly Traffi c Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-21 6-4 Day of the Week Traffi c Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-22 6-5 Day of the Week Traffi c Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-22 6-6 Day of the Week Traffi c Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-23 6-7 Snoqualmie Pass Traffi c, 1989 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-23 7-1 Example of Traffi c Flow and Speed Profi le Used to Assess Data Quality in Phoenix, Arizona . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12 7-2 Missing Data Patterns in Archived Operations Data from Austin, Texas . . . . . . . .7-13 7-3 Priority Traffi c Detectors Designated in Phoenix, Arizona . . . . . . . . . . . . . . . . . . . .7-14 xii GUIDELINES FOR TRAFFIC DATA PROGRAMS © 2009 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
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AASHTO Guidelines for Traffic Data Programs - Table of Contents

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