Istanbul Strait Road Tunnel Crossing Istanbul, Turkey Experience and knowledge enhance safety, efficiency of complex underwater project • Detailed seismic analysis promotes safety • Experience keeps project on schedule • Traffic congestion and travel time decrease, economic benefit increases HNTB performed independent design review and verification for the Istanbul Strait Road Tunnel Crossing through the Bosphorus Strait. Linking the Asian and European sides of Istanbul, the project was challenged by the area’s varied geology and propensity for earthquakes, high pressure below sea level, and the tunnel’s large-diameter/double-deck lane configuration. HNTB’s experience with large-bore tunnels helped delivered significant value through: • Detailed seismic analysis, which helps

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