I was pointed to a website with a number of amusing signs - http://www.nytimes.com/interactive/2010/05/11/travel/funny-signs.html. Some of these are indeed road signs, such as this Dutch one (http://www.nytimes.com/interactive/2010/05/11/travel/funny-signs.html#/4be39206224fe221f00000bc/). So what lost-in-translation signs have you found in your travels?
There's already a thread for this called Funny Signs.
Here's the link: https://www.aaroads.com/forum/index.php?topic=306.0 (https://www.aaroads.com/forum/index.php?topic=306.0)
Feel free to add some of the ones you linked there.
Another place to check out:
www.signspotting.com