Major Railway Leve

Source   Lden Lnight   Lday   Levening   LAeq,16hr   LAeq,6hr   LAeq,18hr   Major Railway  Those which have more than 30,000 train passages per year (for mapping rounds other than Round 1) The day-evening-night level indicator for overall annoyance, based upon annual average A-weighted long-term sound over 24 hours. It includes a 5 dB(A) penalty for evening noise (19:00-23:00) and a 10 dB(A) penalty for night-time noise (23:00-07:00) The night level indicator for sleep disturbance, based upon the A-weighted, Leq (equivalent sound level) determined over all the 8-hour night periods (23:00-07:00) of a year The day level, the A-weighted, Leq (equivalent sound level), determined over all the 12-hour day periods (07:00-19:00) of a year The evening level, the A-weighted, Leq (equivalent sound level) determined over all the 4-hour evening periods (19:00-23:00) of a year The equivalent continuous sound level in dB(A) that, over the period 07:00-23:00 hours, contains the same sound energy as the actual fluctuating sound that occurred in that period The night level, the A-weighted, Leq (equivalent sound level) determined over all the 6-hour night periods (00:00-06:00) of a year The equivalent continuous sound level in dB(A) that, over the period 06:00-24:00 hours, contains the same sound energy as the actual fluctuating sound that occurred in that period   The Common Noise Assessment Methods in Europe (CNOSSOS) methodology introduced a significant number of new data requirements and approaches to computing noise emissions to improve the quality of the maps.  Thus round 4 noise mapping results should not be compared to previous rounds