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The act of creating and encoding a TMC in a digital map involves an interpretation of the road geometries at each location. Different digital map makers may implement TMC Location Tables in slightly different ways, which may be reasonable interpretations when viewed in isolation.
However, this may lead to some users of TMC tables (table owner, map provider, traffic provider, client device) interpreting a table differently, resulting in unexpected behavior
The TMC Conflation TF has produced a set of agreed upon guidelines, which include a number of example scenarios, to assist users of TMC tables (table owners, map providers, traffic providers, client devices) to have a uniform interpretation of information contained within the traffic table.
SP22022 replaces the former SP17005 and SP20015 guidelines.
This 2nd revision includes more examples and clarifications such as:
- New section for Roundabout handling at the end of TMC paths.
- Bridges and Tunnels – Updates to wordings and examples
- New section for dealing with redundant TMC points, including at roundabouts
- Add cases for dealing with parallel exit ramps
- Begin/End of Motorway triangles – clarify definition about “inner slip roads
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