Quantifying Travel Time Delay Induced by Bituminous Asphaltic Concrete Pavement Distress

摘要

The aim of this study is to investigate the extent of travel time delay induced by bituminous asphaltic concrete pavement distress.Travel time delay is the difference between the actual time required by motorists to traverse a roadway section under pavement distress condition and the corresponding travel time under pavement distress-free condition. Pavement distresses are visible symptoms of functional deterioration of asphalt pavement structures. Since functional asphalt pavement distress deals mainly with ride quality and safety of pavement surface, the paper is concerned with estimating travel time delay caused by pavement distress. Consequently, a 'with and without' asphalt pavement distress impact study was carried out in Nigeria. Typical stretch of 500 m two-lane roadway was divided into three parts: free-flow, transition and distress sections. 24hr-traffic volumes, vehicle speeds and types were taken continuously for six weeks. Functional distress types and sizes were collected at all sites. Results show that about 18s total travel time delay would result from100m road length. The paper concluded that potholes and edge subsidence irrespective of how acquired will trigger significant travel time delay.