I can see at the top the word 'Mole' which means they are probably not on a bridge but on part of a harbour... and leistungsfähiger means powerful, which doesn't help much, maybe propaganda.
I don't think they are Czech as the logo looks different here on the left hand page. On the other page (not shown) they are in Dunkirk and Prague, so it could be any dock or beach in Northern Europe....
These pictures came form the excellent publication Army Wheels In Detail British Military Motorcycles (AW12) by Petr Brojo