The installation of highway noise barriers requires careful consideration not only in terms of performance and quality but also in their height. Excessively tall highway noise barriers, once installed, can obstruct the driver's and passengers' view, affect light penetration, and create a sense of oppression. More importantly, overly tall barriers can reduce their stability coefficient, posing obstacles to vehicle traffic during adverse weather conditions such as strong winds.

The appropriate height for installing road noise barriers varies depending on the specific location: For noise barriers along roads passing through residential areas, a height of 3 meters is generally sufficient. This is because the highways passing through residential areas are usually far from the complexes, and the soundproofing effect of the windows and doors in urban residential complexes is also good, so the height of the installation does not need to be excessively high.

Roadside villages should be considered when crossing a highway. To determine the distance from the highway to the village, if there are residential buildings parallel to the highway, the height of the sound barrier should be appropriately increased. Then, a design with an internal bend at the top should be used to significantly reduce the noise impact on surrounding villages. The general installation height is between 3 and 4 meters.

If there are factories or other polluting facilities along the highway that require screening, the height of the sound barrier should not exceed 3.5 meters. This height is sufficient to completely block the passengers' view. In areas where pollutants are dispersed, the height of the sound barrier should be increased, generally around 4 meters. Highway sound barriers can prevent harmful particles from entering the highway, affecting drivers.