Hourly traffic noise level from roads with speed 75 km/h can be indicated from the chart sbelow:
Example - Traffic noise from a road
From the first chart the hourly noise level from a road with 100 vehicles per hour and speed 75 km/h can be estimated to
If the percentage of heavy vehicles is 15% the last chart indicates that
must be added.
It can be assumed that the hourly noise level is approximately
62 dBA + 3 dBA = 65 dBA
Note that this level is only an indication. The noise is influenced by speed, standard and types of vehicles, tarmac quality, type of wheels with or without studs - and more.
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Acceptable noise - dBA - level at typical common locations.
The Noise Rating (NR) Curve used to determine acceptable indoor environments for hearing preservation, speech communication and annoyance.
Outdoor ambient sound pressure levels (dBA) in rural and urban business and industrial environments with or without limited traffic.
The transmission of outdoor sound through and around barriers - the Fresnel Number.
The propagation of outdoors sound vs. distance and attenuation.
Traffic flow and density as used in highway design.