Close to a million people at home suffer road traffic noise higher than 70 dB(A) L10(l hr), which is the minimum acceptable standard in the Hong Kong Planning Standards and Guidelines. 香港规划标准与准则订明的最低可接受道路噪音标准,是每小时有一成时间的等效连续声级为70分贝(a),然而,香港有接近100万人在家里要忍受超逾这标准的道路噪音。