Where must you use a parking disc for parking?

You answered correctly. Parking discs are required when parking at a defective parking meter because the time of arrival needs to be displayed for enforcement. They are also required wherever traffic signs specifically instruct drivers to use a parking disc, such as in signposted time-limited parking zones. However, in a no-waiting area, parking is generally not allowed at all, with or without a disc. If you see a parking disc symbol on a traffic sign, always set your disc to the correct arrival time and display it inside your car. This helps authorities check that you follow the allowed parking time.