The Transport Protocol Experts Group or TPEG, for short was founded in 1997 by the European Broadcasting Union
European Broadcasting Union
The European Broadcasting Union is a confederation of 74 broadcasting organisations from 56 countries, and 49 associate broadcasters from a further 25...

. It is a group of experts led by the EBU
European Broadcasting Union
The European Broadcasting Union is a confederation of 74 broadcasting organisations from 56 countries, and 49 associate broadcasters from a further 25...

 coming from all areas of the Traffic and Travel Information businesses, as well as broadcasting. The group developed the TPEG specifications for transmission of language independent multi-modal Traffic and Travel Information. Validation of the initial work was undertaken by the part-funded European Commission
European Commission
The European Commission is the executive body of the European Union. The body is responsible for proposing legislation, implementing decisions, upholding the Union's treaties and the general day-to-day running of the Union....

 TPEG Project which had a 3 year duration.

The TPEG work was partly based on the work done with RDS
Radio Data System
Radio Data System, or RDS, is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. RDS standardises several types of information transmitted, including time, station identification and programme information.Radio Broadcast Data...

Traffic Message Channel
Traffic Message Channel is a technology for delivering traffic and travel information to drivers. It is typically digitally coded using the FM-RDS system on conventional FM radio broadcasts...

, but TPEG data are human understandable as well as machine readable. In particular TPEG does not assume any large scale location or pre-coded phrase databases in any client receiving device.

Flavours of TPEG

TPEG currently comes in two "flavours". The TPEG binary data format is designed for transmission over DAB
Digital audio broadcasting
Digital Audio Broadcasting is a digital radio technology for broadcasting radio stations, used in several countries, particularly in Europe. As of 2006, approximately 1,000 stations worldwide broadcast in the DAB format....

 and DMB
Digital Multimedia Broadcasting
Digital Multimedia Broadcasting is a digital radio transmission technology developed in South Korea as part of the national IT project for sending multimedia such as TV, radio and datacasting to mobile devices such as mobile phones...

. tpegML is the XML implementation designed for use in editing systems and delivery via the Internet and DVB.

TPEG Applications

TPEG is a modular toolkit, standardised through CEN
European Committee for Standardization
The European Committee for Standardization or Comité Européen de Normalisation , is a non-profit organisation whose mission is to foster the European economy in global trading, the welfare of European citizens and the environment by providing an efficient infrastructure to interested parties for...

 and ISO
International Organization for Standardization
The International Organization for Standardization , widely known as ISO, is an international standard-setting body composed of representatives from various national standards organizations. Founded on February 23, 1947, the organization promulgates worldwide proprietary, industrial and commercial...

 and consisting of the following applications:
  • RTM - Road Traffic Message
  • PTI - Public Transport Information
  • Loc - Location referencing, used in conjunction with applications

Under development are also:
  • PKI - Parking Information
  • CTT - Congestion and Travel-Time
  • TEC - Traffic Event Compact
  • WEA - Weather information for travellers

RTM is an application that deals, as the name says with traffic information. It is a full application that can encode a wide range of road traffic information, from accidents, obstructions to congestion and delays. This application is currently specified in ISO TS 18234-4.

PTI is the natural counterpart to RTM, dealing with public transport from rail, bus to air traffic and ferry services. This application is currently specified in ISO TS 18234-5.

PKI is an application that will allow information about parking facilities to be transmitted. This application is currently at ISO TS 24530-5 Draft for Comments stage.

CTT is an application focused on providing information to drivers on congestion levels and journey times. This application is currently in the late design phase.

TEC is a compact application for traffic event information, aimed primarily at dynamic route guidance navigation devices. This application is currently in the early design phase.

TPEG Location Referencing

TPEG's main renown comes from its native Location Referencing approach, TPEG-Loc. Based to some degree on the ILOC approach, tpeg-locML or TPEG-Loc for the binary service, has been further developed and has added a large amount of sophistication to its ability to describe locations within networks. It principally is used by tpegML and TPEG applications, but has also been adopted by OTAP and Datex.

Design approach

In the early days of the TPEG development applications were designed in two halves. On the one hand there were coding experts and on the other designers. At that time the primary focus was on a binary delivery using DAB.

With the XML becoming more mainstream it was very quickly adopted by the TPEG developers who unified the two separate approaches. At the same time it was clear that XML provided another channel to deliver Traffic and Travel Information.

More recently TPEG developers have turned to UML
Unified Modeling Language
Unified Modeling Language is a standardized general-purpose modeling language in the field of object-oriented software engineering. The standard is managed, and was created, by the Object Management Group...

 to hold the conceptual content and to build new applications. Current work programmes include building UML extracts that will automatically generate the XML and binary specifications.

See also

  • Intermodal Journey Planner
    Intermodal Journey Planner
    An Intermodal Journey Planner , or Trip Planner is computer system which can provide a traveller with an itinerary for an intermodal passenger transport journey. The system can provide timetable, routing and other travel information...

  • Transport Information Standards
  • Transport standards organisations
    Transport standards organisations
    Transportation systems are inherently distributed systems with complex information requirements. Robust modern standards for transportation data are important for the safe and efficient operation of transportation systems...

External links

  • New Official Website of the TMC and TPEG Forum successor the Traveller Information Services Association (TISA)
  • Official Website (being rebuilt - now links to
  • TPEG Draft Specifications
  • UK ITS
    Intelligent transportation system
    The term intelligent transportation systems refers to information and communication technology that improve transport outcomes such as transport safety, transport productivity, travel reliability, informed travel choices, social equity, environmental performance and network operation...

    Registry - TPEG is registered here
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