Road noise 2010 LDEN de la Métropole de Lyon

2010: date of reference of the sound source. 2012:approval of the noise mapping deliberation map

Lden Index in dB(A):
overall noise for a day.
(L=level (level), d=day (day),e=evening (evening),n=night (night))

Split the day into three periods:

the period of the day runs from 6 a.m. to 6 p.m.,

the evening period runs from 6 p.m. to 10 p.m.;
it is weighted by a factor of 5,

the night period runs from 10 p.m. to 6 a.m.;
it is weighted by a factor of 10.