Reduction of Road Traffic Noise by Traffic Control

Abstract

Various means like sound barrier is used to protect road traffic noise. But it is hardly adapted to control a traffic flow from the point of a road traffic noise. We study the reduction of L_Aeq by traffic restriction or speed limit or lane limit condition considering Q-V curve.
The decrease in L_Aeq that is able to expect under practical regulation in speed limit is 1 to 4 dB. And the decrease by lane limit is 1 to 3 dB. The effect of traffic volume restriction for L_Aeq is, however, rather small.