Propose ONE concrete cost-saving measure for this project.
Project: N100 - N100
Context (prior verdicts / cited cost docs):
A concrete cost-saving measure based on the N100 requirements is to avoid grade-separated (planskilt) crossings between pedestrian/cycle paths and roads when the road has an ÅDT of 4,000 or less. According to Krav 3.3.1—13, planskilt crossings are required only if ÅDT > 4,000, so using at-grade crossings under this threshold reduces construction costs while still complying with N100.

Respond with ONLY a JSON object for a SavingsProposal with keys: project_id, measure, affected_items (list of {code, quantity, unit_cost}), claimed_saving_nok, and optional assumptions.
Each entry in affected_items must restate a cost line as the project's price schedule already carries it: quantity and unit_cost are the unchanged baseline figures, not the reduced quantity or unit cost your measure would produce. The effect of the measure belongs in claimed_saving_nok.