At Mercedes test engineers can now put vehicles through their paces without setting a foot out of southern Germany. The automaker's new climatic wind tunnels can simulate temperatures that range from minus 40 to plus 60 degrees Celsius, wind speeds of up to 265 km per hour, tropical downpours and severe snow storms.The new technology means they can test and adapt newly developed vehicles and components to perform well in all weather conditions. drive it! examines this amazing equipment up close.