How to get rid or reduce road sound coming into the house?

An obvious outdoor noise reduction solution to the traffic-noise problem at the Carlisle house would be a high wall to block it out. A barrier fence might also be an effective way to reduce road noise, but only if the structure is solid enough and thick enough to shut out the sound waves. read more

To get an idea of the effectiveness of lanscaping, point a spray hose at it. If water can pass through, sound waves can too. Instead of blocking noise with your yard, add a fountain or waterfall that generates its own noise. These sources of more-pleasant white noise reduce the impact of the road noise. read more

Trees don't reduce noise unfortunately. You need a proper acoustic barrier. Sound is transmitted through the air and through direct contact with continuity of materials. You overcome the first with mass (a tree canopy has little solid mass) and the second by isolation. Acoustic barriers generally use mass to absorb and deflect sound. read more