Mercedes-Benz 540 K Autobahnkurier - There’s good reason why the Autobahnkurier caused a sensation. It’s long hood, sweeping lines and refined elegance were little matched. And when combined with one of the best pre-war chassis, it was also hard to ignore. To maintain brand recognition Mercedes-Benz insisted that this fastback retain the standard front radiator. It also featured the first Mercedes-Benz curved rear-quarter windows.