What is the minimum distance you must leave clear when parking outside a built-up area before a St. Andrew's Cross?

In German traffic rules, a St. Andrew's Cross (Andreaskreuz) marks a railroad crossing. To ensure safety, you must keep a minimum distance of 50 meters when parking outside built-up areas before this sign. This clear space allows drivers and train operators to have an unobstructed view of the crossing, reducing the risk of accidents. Remembering this 50-meter rule helps maintain safe visibility and reaction time near railroad crossings.