Traffic noise testing and collaborative control of elevated and ground-level composite roads

Urban elevated roads increase noise pollution from high-rise buildings due to the sound source lift effect, posing a serious threat to residents' health. This study takes the Guangzhou Huangsha Avenue – Inner Ring Road Elevated bridge as the empirical object, establishes a three-dimensional noise propagation model, quantifies the intensity of vehicle sound sources, and verifies the reliability of the model through nighttime measured data. The study found that the noise peak on the building facade reached 73.4 dB(A), exceeding the standard limit by 18.4 dB, and the high floor area (7-10 floors) was particularly affected by the elevated bridge sound source. To address this issue, a synergistic solution of "5m high sound barrier (elevated bridge) + porous asphalt pavement (ground road)" was proposed. The simulation results show that the combined measures have reduced the building facade noise to A maximum of 18.8 dB(A), and the noise levels at all monitoring points have dropped below 55 dB(A). The research results provide a reusable technical paradigm for traffic noise control in high-density cities and have significant practical value for promoting the construction of quiet and livable cities.