Noise Round 2 Rail (Night Time)

This is a polygon dataset of the strategic noise mapping of rail, which were identified as those rail exceeding the flow threshold of 30,000 vehicle passages per year, in the form of noise contours for the Lnight (night) period for Dublin and Cork agglomerations and the major roads outside of the agglomerations.
The Db Value represents the average decibel value during the night time.