During the day, you must sound your horn outside built-up areas before a sharp bend with limited visibility. At night, flash your headlights instead. Needless use of warning signals is forbidden, especially when there is oncoming traffic.
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In Switzerland, the rules for camping in a car are not uniform. In some cantons or municipalities, spending the night in a car is considered wild camping and is therefore prohibited. In exceptional cases, it is often tolerated, especially if the need for sleep is cited as an argument.