"The city (of Seattle) has a total of six cameras at four high-use intersections:

Northeast 45th Street and Roosevelt Way Northeast;
Fairview Avenue North and Denny Way;
Fifth Avenue and Spring Street;
Rainier Avenue South at South Orcas Street.

Four of the cameras began working in July; the two others started in October."

(Source: Seattle Times, July 19, 2007 - Sorry for not providing more detail and requested GPS format, but figured this was a start for interested parties whom should be able to find such details via google.earth etc.)