The Tsing Ma Bridge (TMB) is the longest suspension bridge (2.2 km) in the world for carrying both vehicle and railway traffic. The TMB is a double deck bridge. The upper deck has two three-lane highways for vehicle traffic. The sheltered lower deck includes two railway tracks and two single-lane emergency roadways for maintenance and ensuring uninterrupted traffic from/to the Hong Kong International Airport during typhoons when wind speed is still within acceptable level. Besides the existing conventional sensors, Fiber Bragg Grating sensors are installed by the Photonics Research Centre of the Hong Kong Polytechnic University to measure vibration, strain distribution and suspension cable tension.

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