YOO
Ok, I'l give you some numbers, and explain the route I've got in mind, but I'm wondering if you're using a GPS or using maps, me personnaly, I'm only using maps, and I reccomend the Michelin 545 Regional for the bit in the Black Forrest, it's just soo easy using it and following the route.
Well, getting to Strasbourg isn't a problem I suppose, from there on you head to Kehl, the river Rhine is the border so Kehl is allready in Germany.
In Kehl, follow the motorway E52 going to the E52/E35, but leave when you're at the junction, and head for Oberkirch on route 28.
Continue till Löcherberg, it's 16km ('bout 10miles) past Oberkirch, and there take right (a smal street, leaving the village going straight up the hill) towards Harmersbach (OberH-, Zell am H-), follow the smal road till you reach route 33, from there stay on R33 for 36km, till Triberg, there take a right (route 500) to Furtwangen, and stay on this road for 27km, than, at a junction, take left, towards Donaueschingen (smal roads again, not havin' a number on the map
) and continue straight on, following route 33 again until you reach the A81 motorway. Get on it, taking direction of Singen.
At Kreuz (which means junction) HEGAU take left towards Stockach and/or Uberlingen, aslong as you go North/West. Contineu straight when teh motorway changes into route 31, and continue on route 31 till you reach Lindau, but stay on R31, don't go into the center, but go straight, and take route 308, which is the Deutsche Alpenstrasse, and stay on it till Garmisch
I don't know if it's always mentionned, 'cause I didn't follow the Alpenstrasse far enough, but I guess (and hope) it's clear to you how to get to Garmisch from here, it's not that there are that many roads to choose from, just follow on the map (I'd get the Regional 546 aswel, it's really handy to be able to follow the roads with green serpentines next to.
There, I think you should be able to ge there now
, and besides, when in the Black Forrest, you can't go wrong, al those roads are worth doing so don't worry, just follow a general direction, and that's it
Grtz, Philip!