Foreigners are allowed to use German highways for free because Germany does not have a toll system in place for passenger cars. On the other hand, Germans have to pay for foreign highways because many other countries in Europe have toll systems in place to help fund the maintenance and construction of their road networks. This difference in toll policies is a result of each country's individual transportation funding strategies and regulations. **

Yes, there are traffic lights on German highways between Berlin and Potsdam. However, they are not as common as on city streets and are usually only found at major intersections or construction zones. The majority of the highway between Berlin and Potsdam is free-flowing with no traffic lights, allowing for smooth and efficient travel. **

Many traffic management systems on German highways are out of operation due to outdated technology and lack of maintenance. The systems were installed several decades ago and have not been updated to keep up with modern technology. Additionally, budget constraints and competing priorities have led to a lack of investment in maintaining and upgrading these systems. As a result, many traffic management systems are no longer functioning properly, leading to increased congestion and safety concerns on the highways. **

There is generally more traffic congestion on German highways on Saturdays compared to Sundays. Saturdays tend to be busier as people are running errands, traveling to weekend getaways, or returning from vacations. On the other hand, Sundays are typically quieter as many businesses are closed and people tend to stay home or engage in leisure activities. However, it's important to note that traffic patterns can vary depending on specific events, holidays, or other factors. **

One can learn highways by studying road signs, understanding traffic rules and regulations, and practicing driving on highways with an experienced driver. It is important to familiarize oneself with highway driving techniques such as merging, changing lanes, and maintaining a safe following distance. Additionally, taking a defensive driving course can help improve skills and confidence when driving on highways. **

Graffiti on highways is considered illegal and is typically seen as vandalism. It can be dangerous as it may distract drivers and obstruct important signs or markings on the road. Additionally, the cost of removing graffiti from highways can be expensive and can divert resources away from other necessary maintenance and repairs. Overall, graffiti on highways is generally discouraged and efforts are made to prevent and remove it. **

I'm sorry, but I do not have real-time information on highway closures. I recommend checking with local authorities or news sources for the most up-to-date information on highway closures. **

Yes, deer do venture near highways, especially during dawn and dusk when they are most active. Highways often cut through or near natural habitats of deer, and the presence of vegetation and water sources near highways can attract them. This can lead to an increased risk of vehicle collisions with deer, especially in areas where deer populations are high. Drivers should be cautious and alert when driving near wooded areas or open fields, as deer may suddenly appear near the road. **