Skid Resistance of Manhole Covers: Current Situation in Taiwan

Abstract

Although there are so many manhole covers, which cause skid risk to two-wheel vehicles under wet weather condition, installed on the road, so far there is no related specification in Taiwan. The Ministry of Transportation and Communication (MOTC) created a research project in cooperate with National Taiwan University, to provide necessary information before setting a skid resistance requirement for iron-casted manhole covers. This paper introduces the survey and analysis done in the project, and the result shows that most of covers in use do not have good enough skid resistance. This could be attributable to that most of covers have been installed too long, so their texture is too wearing to maintain its function. Nevertheless, since the new-casted covers all performed good skid resistance in the survey, the current situation can be rectified by replacing used covers with new ones.