Sound insulation barrier and sound insulation wall which is good!
Sound insulation wall covers an area, large volume, opaque, maintenance and maintenance trouble. High-speed edge is prone to air turbulence. As well as to the past car a sense of oppression.
Each have good or bad.
Sound insulation barrier light, small footprint, light transmission, bridge preferred. Easy to maintain.
Sound insulation barrier is better, convenient, do not occupy the place
