I've had a chance to play a little with routing today and noticed a couple of things. An example would explain this best so here goes. If routing from north of Manchester to somewhere along the M62 westbound then the route is as expected (M66 onto M62 at J18, M60). Bury to Roe Green is an example of this. Bury to Gorse Covert however starts on the M66, turns off at J3, goes through Whitefield and back on to the M60/62 at J17, travels past Roe Green and arrives at destination. Bury to CHester however starts along the M66, goes straight through junction 18 to the next junction where you go all the way round the roundabout, come back on yourself to junction 18 and then turn left onto the M60 where the route is then as expected.This odd behaviour then continues if routing to places further afield that require the same initial route. http://www.openstreetmap.org/?lat=53.5497&lon=-2.261&zoom=14&layers=B000FTF shows the junctions involved but I can't see how it can be data errors as some routes go M66, M62 westbound without problem and all 3 destinations mentioned above are on the same tile Additionally I will occasionally get the odd routes previously described when routing long distances but usually get the optimal route (this is from the exact same starting point. I realise there's a lot that's not yet fully understood in the img file so I just thought I'd report these observations in the hope that they can somehow add to the overall picture Cheers Paul P.S. The routes described are as given by my Edge 605 and not simulated through software