DF has never worked for me. I've never gotten a single ride from it, despite using it in the mornings on the way to my hunting grounds, and in the evenings on my way home. When traveling south on the highways at the end of my day, I set the DF for JBLM or Olympia (far beyond my home). When traveling north on the highways in the AMs to begin my day, I set it for Everett. I've experimented with using and not using arrival times, but neither setting seems to make a difference. When I worked Seattle bar closings on weekends, I'd always set the DF for the drive home, and never got any pings. I've had DF on from Everett to Northgate via I-5, or from Lynnwood to Renton while on I-405, and haven't had any luck. As far as I can tell, I've never even been timed out while in DF mode. So, what's the secret?