Abstract： To investigate the influence of evaluation length on the pavement condition index（PCI）， the PCI was calculated by eight evaluation length to compare with the standard 1 000 m evaluation length result. The results show that when the evaluation length is shorter than the standard evaluation length， the calculated PCI is greater than that calculated by standard evaluation length, while the evaluation length is longer than the standard evaluation length， the calculated PCI is smaller than that calculated by standard evaluation length. The deviation between PCI calculated by the evaluation length at the range of 500 m to 1 500 m and that by the standard evaluation length is small. When the evaluation length cannot meet the standard length, to ensure the accuracy of PCI, the evaluation length should be larger than the standard length.
2015, Vol. 36 
