The Detroit Auto Show opened today and for the first time since its 2009 bankruptcy, General Motors has returned to the family convertible or cabriolet market in North America. What’s a cabriolet look like? You can see dozens every day on Bayivew Ave in the snow. They’re called BMW, Audi, Mercedes and VW. In fact, General Motors makes a German cabriolet too. It’s called the Opel there. So much better than a Mustang or Camaro.