While speed bumps generally slow cars to , humps slow cars to . Zebu have humps on the shoulders, large dewlaps, and droopy ears. The song's outro was compared to The Black Eyed Peas' "My Humps". Humpback whales have a stocky body with well defined humps and black upper elements. Roller coasters also do, whenever they go over dips, humps, or loops. These imperfections lead to local humps and dips in the crystalline material's electric potential. Mature males also have prominent postanal humps. Withers yokes particularly suit zebu cattle, which have high humps on their withers. Camels do not directly store water in their humps; they are reservoirs of fatty tissue. As such, there are talks about putting speed restrictions in place such as road humps. Physical devices include speed humps, speed cushions and speed tables, sized for the desired speed. It has two classification humps and over a hundred tracks. Due to the distinct humps on the endcars it was nicknamed "the camel". Warning signs should be used to notify approaching motorists of upcoming humps. One problematic aspect of speed humps is their effect on emergency vehicles.