The Hangzhou Bay Bridge is of the cable stayed bridge form. This form was chosen for this project because of the strength of the cable stayed bridge in adverse conditions. The bridge was constructed in the Qiantang River and Yangtze River Deltas and Hangzhou Bay, which all experience some of the highest tidal bore forces on the planet. The location of the bridge is also prone to earthquakes, as well as extremely high winds during typhoon season. The bridge form and construction material selections were based on strength against all the different forces the bridge would face.