The old Paul Elbe Tunnel is located in the center of Hamburg. It is considered one of the most famous and oldest city tunnels. It was built in 1911 AD. Its length is about 426 meters. The tunnel connects the different parts of the city to each other. It is used by a large group of cars, numbering about 300,000 cars in 2008. There are also areas designated for pedestrians and bicycles, and there are specific times when cars are allowed to cross the tunnel.