台灣四面環海，濕熱多雨，梅雨及颱風季節之瞬間強降雨，常因降雨集中形成表面逕流，鋪面可能產生水膜，車輛行經時易有水滑現象(Hydroplaning)，影響行車安全，且車輛高速行駛音量影響國道周邊居住環境，多孔隙瀝青混凝土(Porous Asphalt Concrete, PAC)因排水特性佳而受到廣泛應用。本研究檢測PAC鋪面完工通車後之現地變化，進行透水量、噪音量、平坦度、車轍量、CIV值、抗滑度等現地試驗，並分析檢測數據以評估PAC鋪面影響績效變化因素，包括功能性(Functionality)、耐久性(Durability)及安全性(Safety)三大部分。PAC為高比例的粗粒料所組成，鋪面紋理粗糙提供足夠摩擦抗滑能力，高孔隙率具有降噪排水功能，粒料方正性有助於鋪面承載力；長期服務後，現地數據顯示透水性及減噪效果持續穩定表現，除國道6號檢測下坡路段鋪面及國道8號檢測上坡匝道口有孔隙堵塞現象，平坦度、車轍等耐久性表現良好，抗滑度提供摩擦力，增加行車安全，總體而言，多孔隙瀝青混凝土排水佳、低噪音、抗車轍、抗滑度等特性，皆達水準以上表現，本研究評估結果可提供道路主管機關於路面整修、養護管理、維護作業之參考依據。

Taiwan is surrounded by the sea, hot and humid and rainy, rainy and typhoon seasons, and instantaneous heavy rainfall. Rain is often concentrated to form surface runoff. Water film may be formed on the pavement. Vehicles are prone to hydroplaning when passing by, which affects driving safety and drives vehicles at high speeds. The sound volume affects the living environment around the national highway. Porous Asphalt Concrete (PAC) is widely used due to its good drainage characteristics.
This research examines the site changes after the PAC pavement is completed and opened to traffic, conducts field tests such as water permeability, noise level, flatness, rutting, CIV value, and anti-skid degree, and analyzes the test data to evaluate the performance changes of PAC pavement, including Functionality, Durability, and Safety.
PAC is composed of a high proportion of coarse-grained materials. The rough texture of the pavement provides sufficient friction and anti-skid ability. The high porosity has the function of noise reduction and drainage. The squareness of the pellets contributes to the bearing capacity of the pavement. After long-term service, the local data shows water permeability And the noise reduction effect continues to be stable. Except for the pavement of the downhill section of the National Highway No.6 and the uphill ramp of the National Highway No.8, there are pore blockages. The flatness and rutting performance are good. The anti-slippage provides friction and increases driving safety. In general, the characteristics of porous asphalt concrete such as good drainage, low noise, anti-rutting, and anti-sliding performance are all above the standard performance. The evaluation results of this research can provide reference for road supervisors on road repair, maintenance management, and maintenance operations, in accordance with.

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