FBG sensor array systems can be used on many of the world’s longest span suspension bridge carrying both trains and regular road traffic (e.g. The Tsing-Ma Bridge in Hong Kong). The experiment can carry a high-speed dense-channel demultiplexing/interrogation system for FBG sensor arrays (DC to ~20 kHz for all channels simultaneously). This system can detect high-speed events (vibration, impact location and acoustic emission) and the high readout frequency can be used for noise reduction by averaging to achieve sub-pm resolution. Multiple FBG sensors divided into 3 arrays can be installed on different parts of the bridge (suspension cable, rocker and frame section) to monitor the strain of the different parts of the bridge under railway and highway loads. Measurements will reveal the presence of significant higher frequency components in the FBG sensor signal during train passages.