Question juridique clé
Whether the 1996 contribution plan could reopen the final 1987 contribution plan.
Solution extraite
No. A final contribution plan remains binding; the later plan had no independent significance and could not alter the prior allocation of costs.
Motifs extraits
Definitive contributions must rest on an enforceable contribution plan. The 1987 plan had become final and already governed the cost allocation for the whole road. A later plan was neither necessary nor permissible to recalculate only the remaining section.