Silent Corridor reimagines a stretch of the Tehran-Karaj Highway, guided by UN-Habitat and SDG principles. Over 80% of Tehran's water feeds urban irrigation, deepening the water crisis, while roadside pump-irrigated greenery causes hazardous traffic accidents. The project replaces vulnerable green strips with sculptural sound-barrier walls bearing traditional Iranian motifs, muting highway noise while turning the corridor into an open-air gallery. Worn median dividers give way to artistic installations, cutting irrigation-heavy planting; remaining greenery uses only native, drought-tolerant species. To offset the reduced roadside vegetation, we mapped derelict, underused urban lots near the site and converted them into concentrated, low-water green pockets, helping counter air pollution in one of the world's most polluted cities. Result: less water use, fewer accidents, quieter neighborhoods, cleaner air, and a resilient identity for Tehran-Karaj (SDG 6, 11, 13).