Crowd-sourced traffic data

From Slate Magazine

As you traverse your favored metropolis, the Dash Express Navigator anonymously transmits information about its location and speed to a central server. Every other Dash driver does the same. Using this data, Dash can paint a stunningly accurate picture of traffic patterns. Have you ever been stuck in a jam and wished there were some way to look two miles ahead to see whether things are still ugly? Dash essentially does that for you.