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<HTML><HEAD><TITLE>What is Traffic Message Channel (TMC)?</TITLE>
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<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>The Traffic
Message Channel (TMC) is a specific application of the FM Radio Data
System (RDS) used for broadcasting real-time traffic and weather
information. Data messages are received silently and decoded by a
TMC-equipped car radio or navigation system, and delivered to the
driver visually or as human speech in the preferred language of the
user. TMC messages can be filtered so that only those relevant to
the current journey are displayed, while a TMC-enabled navigation
system can offer dynamic route guidance - alerting the driver of a
problem on the planned route and calculating an alternative route to
avoid the incident.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>Benefits for
users</B></FONT></P>
<UL>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Updated traffic
information, delivered in real time</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Instant
knowledge of accidents, roadworks and traffic jams</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Filtered
information only for the immediate route</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Information in
user's own language</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>High-quality
digital transmission</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Europe-wide
compatibility of receivers</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Free or low-cost
services right across Europe</FONT> </LI></UL>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>Instant
information en route<BR></B></FONT><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>TMC traffic
information offers several advantages. First, it is received via a
"silent" FM data channel, which means that users can listen to music
or news broadcasts simultaneously with - and without interference
from - TMC data transmissions. Second, messages arrive and are
displayed immediately, so you don't need to wait for the scheduled
traffic news bulletin, or to listen to a specific programme. Also,
TMC services are continuous and presented directly to the driver,
unlike occasional roadside information services such as variable
message signs.</FONT></P>
<P><FONT color=#000066
face="Arial,Helvetica,Geneva,Swiss,SunSInstant knowledge of accidents, road works and traffic jams ans-Regular"></FONT>
<P><FONT color=#000066
face="Arial,Helvetica,Geneva,Swiss,SunSFiltered information only for the immediate route ans-Regular"></FONT>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>In the user's
language<BR></B></FONT><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Thanks to TMC
receiver technology, users can listen to or view traffic information
in their own language. The TMC unit, typically an in-car navigation
system or radio, decodes the received traffic information and makes
announcements via the vehicle's loudspeakers or displays it
on-screen. No matter in what country the user is driving, he or she
can understand the local traffic situation immediately.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>Across
Europe<BR></B></FONT><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>TMC traffic
information systems conform to a global standard that has been
adopted by traffic data gatherers, information service providers,
broadcasters and vehicle/receiver manufacturers. TMC information is
received via the normal FM radio antenna.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>All TMC receivers
use the same list of event codes, while the location database (on
CD-ROM, DVD or smart card) contains both a country-specific set of
location codes for the strategic European road network.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>TMC traffic data
are already being broadcast in Belgium (Flanders region) Denmark,
Finland, France, Germany, Italy, The Netherlands, Spain, Sweden,
Switzerland and the United Kingdom. Countries planning services soon
are Austria, Belgium (Wallonia region), the Czech Republic, Hungary,
Norway and Portugal.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>How does it
work?</B></FONT></P>
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<P><IMG alt="How does it work?" border=0 height=247
src="what_con.files/how_does.gif" width=600></P></DIV>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>Data related to
traffic flows, incidents, weather etc. are gathered from traffic
monitoring systems, emergency services, motorists' calls etc., and
are collated at a central traffic information centre. They are then
passed to the TMC traffic information service provider, who
generates TMC messages according to the ALERT-C coding
protocol.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>What information
is included in a TMC message? Standard TMC user messages provide
five basic items of broadcast information:</FONT></P>
<UL>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>event
description</B>, details of the weather situation or traffic
problem and its severity</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>location</B>,
the area, highway segment or point location affected</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>direction and
extent</B>, identifying the adjacent segments or point locations
affected, and the direction of traffic affected</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>duration</B>,
how long the problem is expected to last</FONT>
<LI><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular><B>diversion
advice</B>, whether or not drivers are advised to find an
alternative route.</FONT> </LI></UL>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>The service
provider sends the coded messages to the appropriate FM radio
broadcaster for transmission as an RDS (Radio Data System) signal
within normal FM radio transmissions. The TMC data are received by
the vehicle radio and antenna, and decoded by a TMC decoder. This
reconstructs the original message, using a database of event and
location codes, which is presented to the driver as a visual or
spoken message.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>It takes typically
about 30 seconds from the first report of a traffic incident to the
traffic information centre until the same information is available
in the vehicle.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>The user can
select the language used to present the traffic information by the
TMC receiver, typically a navigation system or car radio. The user
can also opt to filter messages, so that only those concerning the
immediate route are selected.</FONT></P>
<P><FONT color=#000066
face=Arial,Helvetica,Geneva,Swiss,SunSans-Regular>New delivery
channels are emerging that could carry TMC services, including
digital radio (DAB), mobile Internet, paging and GSM/GPRS mobile
phone networks.</FONT></P>
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