Welcome to the Proceedings of the 2026 9th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA 2026). This symposium aims to establish a high-level, international, and interdisciplinary academic platform for exchange and collaboration. The conference featured in-depth discussions on topics including intelligent transportation systems, green and low-carbon infrastructure, road and bridge engineering, urban transportation planning, underground space development, resilient city construction, smart construction, digital design and management, and the application of artificial intelligence and big data in engineering. It is dedicated to promoting the sharing of the latest research findings, the exchange of advanced technologies, and the collision of innovative ideas.

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