Joint Task
Force on
Traffic Monitoring Standards
of the AASHTO Highway Subcommittee
on Traffic Engineering
American Association of State Highway and Transportation Officials
Washington, D.C.
ISBN 1-56051-054-4
The objective of the Guidelines is to improve the quality of the traffic information that supports decisions at all levels of the transportation profession. To realize this objective, the AASHTO Guidelines for Traffic Data Programs (Guidelines) provides a reference for professional traffic monitoring and establishes a process for adoption of national traffic monitoring standards.
The Guidelines
are intended to identify the importance of common and consistent practice
within and among transportation agencies. Its scope ranges from field
equipment to traffic reports. There is a need to define and work toward
a common traffic monitoring practice on a national basis. The document
is structured to 1) establish the principles and perspective which frame
the Guidelines; 2) describe how the traffic program and staff requirements
are related to data needs; 3) list current types of devices and associated
testing procedures; 4) provide a basis for differentiating between valid
and invalid traffic measurements; 5) provide recommendations for aggregating
traffic volume, vehicle classification, and vehicle weight data and procedures
for computing and applying axle, seasonal, and annual growth factors;
6) present the importance of Truth-in-Data and provide procedures for
estimating the precision and bias of reported statistics; 7) describe
the standard practice for data retention; 8) discuss quality control measures;
and 9) provide a glossary with abbreviations and definitions to provide
a common terminology.
key words: traffic data collection, traffic monitoring, traffic data
Last Modified: March 20, 2007
Maintained by: traffic@nmsu.edu
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