Abstract
: In this study we surveyed the speed difference between road sections and tunnel sections on the highways under the given conditions, selected the variables which are expected to cause the speed difference, verified the significance of the data via statistical analysis, and examined the cause of speed difference between road sections and tunnel sections on the highways. We selected 20 tunnels for analysis, and collected the vehicle speed data from FTMS and ITMS. Based on this data, we selected 9 variables which were considered to cause the speed difference; Lateral clearance, Height, Portal shape, etc..
We further deduced the factors of speed difference between the road sections and the tunnel sections on the highways via principal component analysis between the 9 variables and regression analysis.
