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It is recognized that some of these terms are used in different manners by the various States. There are many different terms used in the TMG to discuss the development and implementation of a traffic monitoring program. The purpose of this section is to frame the basic definitions of terms for the remainder of the TMG, and it is supplemented with a more comprehensive Glossary of Terms in Appendix A.
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This chapter is organized into the following four sections:ġ.2 Terminology – introduces the technical terms used in the Traffic Monitoring Guide (TMG).ġ.3 Detection Theory – introduces the theoretical concepts behind current traffic monitoring technologies and compares the strengths and weaknesses of each.ġ.4 Detection Technology – describes the types of data useful to a traffic monitoring program and introduces the sensors used for traffic monitoring.ġ.5 Variation of Traffic Data – provides background information about what variation occurs in the traffic stream, and how that variation shapes the design of a strong traffic monitoring program. This chapter describes the types of data that should be collected, the technologies that are currently available for collecting those data, how agencies should examine those technologies for meeting their traffic monitoring needs, and the characteristics of traffic data that should be incorporated into the design of a strong and effective traffic monitoring program.īackground information on the science and concepts used in traffic monitoring is discussed to guide the States in developing a traffic monitoring program that not only meets their needs, but also supports the need for traffic data at the national and local levels. Traffic monitoring is performed to collect data that describes the use and performance of the roadway system.
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Chapter 1 TRAFFIC MONITORING THEORY, TECHNOLOGY AND CONCEPTS 1.1 INTRODUCTION