I looked at the map today (Collins Toad Atlas 2005) :o ) to see what route it was trying to take me down. It would taken me in a much "as the crow flies" route from J14, but all A roads...so may be it was trying to reroute me...
Scott - have you ever "disobeyed her" (SATNAV that is, not the wife... :winky: ) and gone stratight into the traffic congestion to see if it actually exists? That's where I think mine is barmy, because on the few occasions that I have headed for the congestion I have actually been better off...
Back in the days when I had to travel across Dublin city to get to and from work I used to always head in the direction that the radio said there was a traffic jam. My theory was that if everyone was getting the same traffic report as me then they were all heading the other route and the jam should clear quickly while a jam formed in the other direction.