Harriers used various roads - mostly within army training areas - in Germany regularly. On one occasion, we used an Autobahn for a deployed exercise - the German police closed the Autobahn from 0800 to 1600 ISTR for our use, then opened it again for normal traffic. The campsite was on a rastplatz which had not, at that stage, been built.
In the late 70's, on Jaguars, we used an Autobahn near Ramstein for training, along with other conventional jets.
The A1 near Leeming??? Perhaps used by Lossie Jags. By then, they could have reached take-off speed, particularly as it is all downhill!!