Which are the areas you must not drive into when there is traffic congestion?

In German traffic rules, you must never enter crossroads (intersections) or level crossings (railroad crossings) if you cannot leave them immediately. This ensures that you do not block traffic or create dangerous situations. Driving into these areas during congestion can cause gridlock or block emergency vehicles. Driveways, however, are private access points and are not specifically prohibited to enter during congestion. The key rule is to keep intersections and level crossings clear to maintain smooth and safe traffic flow.