The days of switches and buttons in cars are over. In modern cars everything from the navigation system and the radio to the air conditioning and the windshield wipers is controlled using a touchscreen. That brings convenience but also new controls to master. Unfamiliar traffic and road conditions can require a lot of attention, particularly when you’re driving in another country. Add in controls that you haven’t used before and the risk of an accident increases. For that reason, Dekra, a vehicle testing organisation in Germany, is calling on all anyone renting a car during a summer break to f…