parking discs showed the regulations on the back side. A later development in Switzerland was the introduction of red zones allowing for a maximum of 15 hours. This scheme required another parking disc that would allow for 24 hours to be shown. The EU-parking disc design was introduced in 2000 and the old designs abolished in 2003. This gave rise to some confusion among car drivers since the old parking regulations denoted "1:30 h" of maximum parking time while the new parking regulations imposed a limit of "1 hour". Since this time is rounded up to the next half of an hour there was no real difference however. The blue zone parking lots were kept however in the same way as before so that the new disc parking scheme reads as follows: Arrival Time Parking Time 08:00 - 11:30 1 hour 13:30 - 18:00 1 hour This regulation is not mandatory on Sundays and national holidays. Effectively the actual legal parking time in the blue zone differs widely - arriving at 11:30 allows for legal parking up to 14:30 (about 3 hours) and arriving on Saturday at 17:31 allows for parking up to Monday 08:00 (more than 38 hours) The Blue Zone parking regulations are effective continuously i.e. they are not restricted to the time span of the arrival time - a parking disc must always be used when parking a car in the Blue Zone (unlike in other countries where a parking disc does not need to be used outside the indicated times). The police regulations set the parking scheme as follows: Bei jedem in einer Blauen Zone parkierten Fahrzeug muss eine Parkscheibe gut sichtbar angebracht werden. Fahrzeuge dürfen an Werktagen (Montag bis Samstag) zwischen 8.00 und 11.30 Uhr sowie zwischen 13.30 und 18.00 Uhr eine Stunde in der Blauen Zone parkiert werden. Bei einer Ankunftszeit zwischen 11.30 und 13.30 Uhr gilt die Parkerlaubnis bis 14.30 Uhr. Bei einer Ankunftszeit zwischen 18.00 und 8.00 Uhr bis 9.00 Uhr. Zwischen 19.00 und 7.59 Uhr muss die Parkscheibe nicht angebracht werden, sofern das Fahrzeug vor 8.00 Uhr wieder in den Verkehr eingefügt wird. In the Blue Zone every parked vehicle must show a parking disc. On weekdays (Monday through Saturday) vehicles may be parked for one hour between 8:00 and 11:30 as well as between 13:30 and 18:00. With an arrival time between 11:30 and 13:30 the parking allowance is valid