cool things with wheels, since 2006
I visited Japan for the first time last year and noticed many of their Police cars had slightly bulbous lights on the roof as well. Only when I returned home and looked into them on the net did I discover they also elevate using a scissor mechanism!http://www.thetruthaboutcars.com/wp-content/uploads/2013/02/japanese-patrol-car.jpg
Police cars in Japan run a scissor lift light bar like that, just a bit smaller and more efficient....kinda like their take on the club sandwich.
think the police cars in the original Mad Max movie in '73 had those