Mercedes-Benz is testing its Future Bus with CityPilot on a 12.5-mile route through Amsterdam. Photo by Mercedes-Benz.Mercedes-Benz parent company Daimler isn’t just preparing for a future of self-driving cars. Because the German manufacturer produces everything from passenger vehicles to commercial trucks, it’s spreading automation across its offerings, which now extends to city buses.

After demonstrating Highway Pilot in Germany two years ago on an autonomous Actros truck and self-driving on a Daimler-built Freightliner semi here in the U.S. in 2015, Mercedes-Benz is testing its Future Bus with CityPilot on a 12.5-mile route through Amsterdam. The Future Bus is running along Europe’s longest bus rapid transit lane between Amsterdam’s Schiphol airport and the town of Haarlem and operates autonomously at speeds up to around 40 mph.

Mercedes-Benz says that the route is a “real challenge for the Mercedes-Benz Future Bus, as it has numerous bends and passes through tunnels and across junctions with traffic lights.” A driver is behind the wheel to monitor the system and any intervention overrides the autonomous mode.

The Future Bus uses almost a dozen forward- and backward-looking cameras to scan its surroundings and long- and short-range radar to monitor the route ahead. It also communicates with traffic lights so that it can optimize its speed relative to red and green phases as well as safely negotiate intersections.

Mercedes-Benz says that timing travel to traffic lights “saves wear and tear while lowering fuel consumption and emissions. With its smooth and even rate of travel it also improves the comfort of its passengers.”