Höhr-Grenzhausen is easy to reach, it lies near an access road to the autobahn A48. You can reach the A48 from the A3 (Cologne-Frankfurt) over the three-way autobahn intersection "Dernbach Dreieck" direction Trier or from the A61 (Ludwigshafen-Cologne) over the autobahn crossing intersection "Koblenz Kreuz" in the direction Frankfurt. Leave the A48 at the Höhr-Grenzhausen exit, leave the next roundabout by the first exit. After approx. 400 m you will see first the RASTAL Works, then the adjoining RASTAL offices.
You can look through a detailed route planner here.
The ICE railway station at Montabaur on the Cologne Frankfurt line is only 10 minutes from Höhr-Grenzhausen. From the German Railways, Deutsche Bundesbahn, you can get information about the local transport connections from the ICE railway station to Höhr-Grenzhausen.
The Cologne-Bonn, Frankfurt and Hahn airports are about 30 to 50 minutes away by car over the A61.