From Wikipedia:

TÜVs are German businesses that certify the safety and rule-compliance of products of all kinds. As independent consultants, they examine factory plants, motor vehicles, energy installations, amusement rides, devices and products which are subject to mandatory monitoring.

Now look at the logo of TÜV Rheinland Group: http://www.tuv.com/en/corporate/home.jsp

Could be a coincidence, could be a nice way to transport children from one place to another (-> Speculation!).