I dont think there is a country in the world that does not fly at high level in its own or international airspace and photograph the neighbours back garden.
Soviet and other interesting shipping albeit usually innocent has always been photographed. I dont know if we are still that paranoid, but I have had experience of this in the last 20 years.
Autobahn use by Canberras is an interesting one. Jaguar has done it in the UK when launched in 1969. Harriers did it in Germany and Swiss and Swedish fighters do it in their respective countries. Certain lengths of autobahn were designed "straight" as part of the cold war plans, so it is pheasable, but I do not know if it was actually done during that time.
The book "RAF Germany" may provide you with some answers, it is expensive but very concise.