Is there anyway to specify certain routes to take? For example, in Google Maps you can click and drag a route to change it. I ask because I take this route to go up to my gf's parents' house and I can either continue on the highway or take an alternative tunnel (bypassing traffic). I guess Google decides it's faster to go straight on the highway (I suppose it would if you had no traffic) but I want it to go thru this tunnel instead.

I've tried using gmap to gpx after changing the route using maps.google.com but importing the resulting .gpx file into maemo mapper just results in straight lines from waypoint to waypoint..