Changes

Crossing of the A57 and the Parkgurtel ring road. Get there using the S-Bahn get off at station Nussbaumstrasse and walk direction east until you get to the traffic lights. All the people turning left are going on A57 and there's a good chance they're heading on the A1 later. Like mentioned above, ask for Remscheid service station. The spot is protected from the rain by the train bridge! The cars only stop at the red lights, so you will have to do some jumping around.

On the motorway ring before Cologne, to the west of the city, there is the motorway service area Autobahnparkplatz Frechen. You can reach it by catching a train to Frechen-Königsdorf (around 20 minutes). Turn right on the stairs at the station, walk through the car park, turn left on Augustinus Straße, walk straight for 2 minutes and then turn right on to Marienhöfer Weg. Keep walking up this path into the forest for 5 minutes. Eventually you will come to a crossroad, but take the tunnel under the Autobahn. After, take the first exit on the left. You will eventually reach the Frechen Tankstelle in the direction of Cologne.