NETHERLAND:
Traffic near airport of Rotterdam and a few other cities.
http://verkeer.anwb.org/rotterdam/
One color continuous from white (fluid) to red (slow)
The White blends in the map and Red stands out.

SPAIN – Madrid
http://www.dgt.es/carreteras/Detectores/etdmad0.html
I didn't quite understand what the legend is (may be the thicker the
line, the denser the traffic?)
CANADA: Toronto
Main focus is on cameras in limited areas (i.e. a few mainly straight road segments.)
http://www.mto.gov.on.ca/english/traveller/compass/camera/cammain2.htm

Note the "which way is the camera facing?" link.
This site also provides a reasonably good system description for public
http://www.mto.gov.on.ca/english/traveller/compass/missaga/missmain.htm
GREECE - Athens, (in English!)
http://frida.transport.civil.ntua.gr/map/index.html
update every 15 min
Large number of colors, hard to interpret at a glance.
Check the about... at http://frida.transport.civil.ntua.gr/map/aboutmap.html
VIRGINIA SNOW CONDITIONS
http://www.vdot.state.va.us/roads/eocsalem.html
Color order is not obvious...
SEATTLE
Detailed Intersection Information
TEXAS
Closure Information
A good preview of where there is data before you zoom to see the details.
SMART TRAVELLER (e.g. DC)
http://www.smartraveler.com/scripts/wdcmap.asp?city=wdc&cityname=Washington_DC
This simple looking map is selectable, and for each area traffic conditions and
estimated time is given. But when I used it there didn’t seem to have a way to get an overview of where there was detail data,, i.e. no view of the accidents in the DC map overview. Links to camera (they seem to have their own cameras)
(END PART 3 - return to : index)