A Location Table is a structured set of location-reference data for a road network. It identifies intersections, road segments, directions, and Location Codes, allowing traffic information from different systems to refer to the same physical location consistently.

A Location Table enables traffic events — accidents, congestion, roadworks, flooding, and lane closures — to be located accurately and interpreted consistently between iTIC and member systems.

iTIC manages and publishes the Location Table in collaboration with an external map-data provider, supporting updates that reflect changes in the road network. iTIC coordinates the process, reviews data completeness, prepares new versions, and notifies members when updated data is available. The names of the map-data provider and member organizations using the data are not disclosed in this public document.

Road networks change over time — new roads, connectors, elevated roads, junction improvements, and traffic-direction changes. Keeping the Location Table up to date helps ensure traffic information is accurately referenced and displayed.

Location Table updates may include:

• Adding Location Codes for new roads, intersections, or routes
• Updating road names, reference points, or coordinates
• Revising traffic-direction information
• Updating connections between Location Points and road segments
• Retiring Location Codes that are no longer in use
• Improving data to support member and downstream-system use

iTIC uses the Location Table as a location-reference source for producing and distributing traffic information in Thailand. TISA (Traveller Information Services Association) is an international organization that supports standards, validation, and certification services for TMC Location Tables, helping promote data quality and interoperability.

• iTIC: Uses and publishes the Location Table to reference traffic-event locations.
• TISA: Supports standards, validation processes, and certification for TMC Location Tables.
• Members: Use the Location Table to connect traffic information to their maps and services.

TMC (Traffic Message Channel) is a method for coding and distributing traffic and travel information. It uses Location Codes from a Location Table to identify the location of an event, helping providers and downstream systems interpret event locations consistently.

Submitting a Location Table for TISA validation or certification helps confirm that the table aligns with applicable TMC standards and best practices. TISA reviews new and updated Location Tables and operates a certification process for tables that pass the required tests.

Note: TISA does not receive iTIC's daily traffic-event feed. Its role relates to standards, validation, and certification of Location Tables used for TMC services.

TIS 2604 is the Thai Industrial Standard for Traffic Information Service and Exchange, developed by the Thai Industrial Standards Institute (TISI). It supports a consistent approach to providing, managing, and exchanging traffic information among organizations and systems.

• TIS 2604: Thailand's standard framework for traffic information service and exchange
• Location Table: Location-reference data for a road network, including intersections, road segments, directions, and Location Codes
• TMC: A method for coding and distributing traffic-event information using Location Codes
• TISA: An international organization supporting standards, validation, and certification for TMC Location Tables

Accordingly, TIS 2604 supports traffic information exchange in the Thai context, while the Location Table and TMC enable traffic events to be precisely located and shared between systems.

1. The map-data provider updates data based on road-network changes.
2. iTIC reviews the completeness and appropriateness of the updated data.
3. A new Location Table version is prepared, with a record of changes.
4. Relevant validation or TMC Location Table certification processes are conducted, where applicable.
5. iTIC notifies members and makes the new version available.
6. Members update their systems with the latest version.

Traffic information services and exchanges are carried out in accordance with applicable standards and requirements, including TIS 2604 within the relevant operational scope.

Members should monitor update notifications from iTIC and implement the latest Location Table in accordance with applicable technical guidance, so their systems can correctly interpret Location Codes and continuously display traffic information.

Using an outdated Location Table may result in:

• Inability to support newly added roads, intersections, or routes
• Incorrect display of event locations
• Failure to interpret certain Location Codes
• Incomplete data reception or display
• Reduced quality of service for end users

In general, a Location Table update changes location-reference data rather than the TMC message structure itself. However, members should review each release's change details — such as added, modified, or retired codes — to assess operational impact and plan system updates accordingly.

Yes. Members may report suspected inaccuracies or changes in the road network to iTIC for review and coordination with relevant parties. Information to include in a report:

• Road name, intersection, or reference point
• Description of the issue or requested correction
• Coordinates, map, or supporting images, if available
• Date the issue or change was observed
• Impact on the system or service

1. A new road connector opens.
2. The map-data provider adds the relevant points and road segments to the Location Table.
3. iTIC reviews the update and prepares a new Location Table version.
4. Relevant validation or TMC Location Table certification processes are completed, where applicable.
5. iTIC notifies members about the update.
6. Members update their systems.
7. When iTIC sends an event with the related Location Code, member systems can match it to their maps and display it accurately.