RLS-90
Emission Value L*m,E
The emission value of parking lots in RLS-90 is the mean level L*m,E at 25 m distance from the center point of the parking lot area with unobstructed sound propagation RLS-1990:
\(L^*_{m,E}=37+10\lg(N*n)+D_P\)
with
- N: number of events per parking space and per hour (see below)
- n: number of parking spaces on the parking lot or on a part of the parking lot
- DP: correction for different types of parking lots
Note
When assessing the number of parking events the approach and departure of a vehicle is counted as one event each.
If the condition li <= s/2 (li: largest dimension of the parking lot, s: distance center point receiver) is not met the parking lot’s area has to subdivided into partial areas i. In case the parking lot’s area is screened the condition to fulfill is: li <= s/8.
Number of Events per Parking Space and Hour
accord. to RLS-90, table 5:
| Type of Parking Lot | Number of Events per Parking Space and Hour | |
| Day (6-22 hours) |
Night (22-6 hours) |
|
| park-and-ride parking | 0.3 | 0.06 |
| motorway service area | 1.5 | 0.8 |
Note
Per default, the number events for period Day are also used for the period Recreation Time/Evening.
Parking Lot Type
accord. to RLS-90, table 6:
| Parking Lot Type | correction Dp in dB |
|---|---|
| Parking: Auto | 0 |
| Parking: Motorcycle | 5 |
| Parking: Truck / Bus | 10 |
Sound Power Level PWL
Sound Power Level PWL in dB(A) for the daily periods Day/Evening/Recreation Time results from:
\(L_{wA}=L^*_{m,E}+17dB + 19.2 dB\)
In equation 21 RLS-90 RLS-1990 line-source propagation is assumed since:
\(11.2-20\lg(s)=11.2+(8-10\lg(2\pi))-20\lg(s) = 19.2-10\lg(2\pi s^2)\)
where \(8-10\lg(2\pi) = 0\)
The expression s/200 in equation 21 represent the air absorption.