How can highway traffic noise be reduced?
Several options are available. First, VDOT engineers try to reduce the anticipated noise while they are designing the road by shifting it away from the affected properties. They also consider reducing the speed limit, restricting heavy truck traffic, or designing the road so its surface is lower through the affected area, creating a natural sound barrier. Another option is the use of earthen berms to block noise. If designing the road differently will not reduce noise, VDOT engineers then consider noise walls. The walls can reduce traffic noise significantly and improve quality of life for people living behind them. Noise walls must meet the following conditions: • They must not create a safety or engineering problem. • They must reduce noise levels by at least five decibels for the impacted properties that the noise wall protects. • They must cost $30,000 or less per noise-impacted property.
