Out-of-Home / Billboard Copy

1Write OOH creative for the 6-second read.
2
3INPUT: brand + message: {{message_context}} | placement context: {{placement — highway | transit | street-level | airport}} | campaign goal: {{goal}}
4
5RULES: 7 words maximum (highway: 5), one thought, legible-at-distance logic (the copy IS the design constraint — note minimum type-size implication), no URL recall fantasy (brand memorability over response mechanics — unless street-level/transit where dwell time allows a short URL/QR), placement-aware wit (a traffic-jam joke works on the highway, not in the airport), and the campaign-system option: 3 rotating lines that build on each other for multi-board buys.
6DELIVER 5 options, each with: line, the visual concept in one sentence, and the placement it's strongest for.
7
8OUTPUT — ONLY JSON: { "options": [], "system_set": [] }