Noise on main roads - Level grid LNight - Mapping 2017

The data include the calculation results of the environmental noise mapping 2017 on the main roads in Bavaria. Outside agglomerations, these are all motorways, federal and state roads, which according to the 2015 traffic census have a traffic load of more than 3 million motor vehicles per year. This corresponds to an average daily traffic volume (DTV) of more than 8,200 vehicles per day. Within metropolitan areas, these are all roads with a DTV of more than 8,200 cars per day.
The noise indices LDEN and LNight in dB(A) are used as a measure of general annoyance or as a measure of sleep disturbances. The LDEN level is an emission level averaged over 24 hours, which is determined from the LDay, LEvening and LNight levels for the assessment times day (6:00-18:00), evening (18:00-22:00) and night (22:00-6:00). Weight factors of 5 dB(A) for the four-hour evening time and 10 dB(A) for the eight-hour night time take into account the increased sensitivity to noise during these times.
The layer represents the noise pollution on main roads expressed by the noise index LNight according to the EC Environmental Noise Directive.