Question juridique clé
Whether Art. 50 SVAV validly authorizes withdrawal of vehicle documents and plates for unpaid heavy vehicle tax.
Solution extraite
Art. 50(1) SVAV exceeds the statutory framework because the heavy vehicle tax statute does not provide a formal legislative basis for this administrative sanction.
Motifs extraits
The tax debt is a public-law money claim enforceable only through debt enforcement. The ordinance may regulate collection details and security measures, but withdrawal of plates and vehicle documents is a burdensome sanction affecting economic freedom and therefore requires a formal statutory basis.