Lärmfibel

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	1.	Introduction
	2.	Planning foundations
	3.	Traffic noise
	4.	Industrial noise
	5.	Noise from sports and leisure facilities
	6.	Noise abatement plans / Noise action plans
	7.	Planning indications
	8.	Bibliography
	9.	Thematic Websites
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	dB-Calculator

	dB-Calculator

Addition and averaging of noise levels

We simplify a complex calculation!

Decibel Calculator

Calculation of road traffic noise

Noise pollution is generally determined through calculations. The calculation of road traffic noise is based among others on RLS-90 (Guidelines for noise protection measures at roads). This method of calculation is very complex as sound propagation is influenced by a number of parameters. There is a simplified method of calculation for long and straight lanes, which provides orientation values for a general view.

Our decibel calculator helps you to determine the relation between average sound level and traffic volume, truck percentage, speed, road surface, gradient as well as the distance to the sound source (and the depending degree of absorption). What cannot be considered is topographic characteristics, barriers and development. The decibel calculator gives you values for the individual parameters you have filled in. The starting point is always the average sound level in a distance of 25 m and the speed limit is set at 62 mph (100 km/h).

The conversion factors from average daily traffic volume (DTV) into traffic volume per hour as used in RLS are also available. This conversion can be useful in case the amount of trucks is explicitly known but the traffic volume is only given as a daily average. What has been added is a table with correction values for noise-reducing road surfaces on roads out of town.

Both aspects have not been integrated into the decibel calculator in order to keep it as clear as possible. For additional information, please click on this button

And here are the two calculators:

Known: Hourly traffic volume and truck percentage

Known: Average daily traffic volume