Traffic Location Tables - Introduction

Traffic Location Tables – Introduction

Overview
A traffic location table is a set of defined locations used to specify places and positions in in traffic and travel information messages. These locations are identified and referenced by their location code. A Traffic Service uses a pre-defined location table, containing the pre-stored details of the locations that can be referenced in messages from that service. A location code in such a message refers and serves as a tabular kind of address of the pre-stored location details. It provides a standard way to reference locations, so that systems can correctly interpret and display traffic messages.

How the Structure Works
Traffic location tables follow a hierarchical structure of pre-defined locations. A system of pointers provides upward references to higher-level locations.

Areas
Represent larger regions (for example, cities or regions). Areas can be similar to the Admin structure in the HERE database, Country, State/Province, and County.

Linear locations
Represent road stretches (for example, highways). A Linear Location is a path of consecutive Road Elements along a road whose TMC codes correspond to a named road.

Point locations
The point reference is what is typically referred to as the TMC location. The purpose of the Point Location is to communicate a specific point in the real world so that a traffic provider can tie incoming information about traffic conditions to the TMC code that will then be transmitted in the HERE traffic feed.

Together, these elements create a reference system for dynamic traffic data on the HERE map.

Standards and Specifications
Traffic location tables follow internationally defined standards:
CEN/ISO TS 14819-3

Additional References
For more detailed information on traffic coding in HERE systems, refer to the HERE Customer Technical Reference Guide – CTRG.