Questione giuridica chiave
Whether the appeal against the road-category designation was admissible despite being a preliminary decision.
Decisione estratta
The designation was only an interlocutory decision; no irreparable harm was shown, so the appeal was inadmissible.
Motivazione estratta
Road categorization did not yet determine the appellants' contribution liability. The binding allocation of costs would arise only later in a contribution plan or separate order, which would itself be appealable.