Could one of our correspondents who regularly travel through Spain take a photo of the sign that shows a caricature of a “truck pulling uphill with a couple of cars about to hit it” and either post as a reply or PM me. It’s for a project for my nephew. In advance, many thanks. 
Would a German one do ?
I go to Germany most weeks and see similar signs fairly frequently.
Thank you, yes, it would be good for him to have as much as possible.
Cheers Tim