To get the TrafficRadar.dll (trafficradar.zip) revised by Dough Dawson to work, the following entries must be in the dll.xml:
<Launch.Addon>
<Name>Traffic Radar</Name>
<Disabled>False</Disabled>
<Path>Modules\TrafficRadar.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>Traffic Info</Name>
<Disabled>False</Disabled>
<Path>Modules\TrafficInfo.dll</Path>
</Launch.Addon>
Of course, TrafficInfo.dll (taken from fs9) must be installed. and TrafficRadar.dll also in the modules folder.