Abstract
In the U.K. prediction method for L10 noise levels from road traffic
single figure corrections are used to allow for the effects of reflecting
facades. In this paper, simple expressions are proposed as improved
corrections. These are derived for facades lying parallel to the
road by using geometrical reflection theory and the equations for
distance and angle of view effects given in the U.K. prediction method.
The expressions are functions of the receiver and reflector distance
from the road, the angles subtended by the source line and the image
of the source line at the receiver and also the type of ground cover.
The corrections are compared with the results of computer simulations
and show good agreement.
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