Key legal question
Whether Art. 48 para. 2 OSR lacked a sufficient legal basis insofar as it prescribes a specific parking disk.
Extracted holding
The Federal Council acted within its delegated power to regulate blue-zone parking and to prescribe the uniform form of the parking disk.
Extracted reasoning
The delegation in the Road Traffic Act allows complementary and completing traffic rules, including practical control measures for blue-zone parking; the restriction on drivers is minor and proportionate.