Market, Marion, Center, and State are all shown with dotted green lines - all very busy roads without bike lanes!
Google will be announcing it tomorrow at the National Bike Summit. More later!
From the google blog:
We've also added information about bike trails, lanes and recommended roads directly onto the map. This can help you get a better sense of your route, or let you find trails nearby for a recreational ride. When you're zoomed into a city, click on the "More" button at the top of the map to turn on the "Bicycling” layer. You'll see three types of lines appear on the map:Needless to say, these stretches of Market, Marion, Center, and State should not be "designated as preferred." We'll find out the data source and how/what might have been interpolated.
* Dark green indicates a dedicated bike-only trail;
* Light green indicates a dedicated bike lane along a road;
* Dashed green indicates roads that are designated as preferred for bicycling, but without dedicated lanes
At the National Bike Summit, Bikeportland has a great little interview with the folks at google. Still working on the exact source of Salem-area data...