Parking discSwitzerland
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65. Parking disc
A parking disc is a device used to indicate the time a vehicle was parked in an area where parking duration is limited. The driver sets the disc to the required arrival time and displays it clearly inside the vehicle.
Parking-disc systems are commonly used in blue zones or other time-limited parking areas. The permitted parking duration, operating hours and method for setting the disc depend on national or local rules and the traffic signs in place.
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What is a parking disc used for?
A parking disc shows when a vehicle arrived at a time-limited parking space. It allows parking enforcement officers to determine whether the permitted parking period has been exceeded.
Where should a parking disc be displayed?
It should normally be placed clearly visible behind the windscreen or in another position specified by local traffic rules so that the indicated time can be read from outside the vehicle.
Can you change the time on a parking disc without moving the vehicle?
Generally no where the applicable rules prohibit extending the parking period in this way. The vehicle normally has to leave the parking space before a new parking period can begin.

Traffic rules
Switzerland