Abstract: There are many factors to cause traffic accidents,one important cause is that road surface resistance to slipping can not fit auto traveling speed,especially when the road is not maintained property.Both the adhesion coefficient separation between left and right wheels and sudden change of adhesion coefficient in a section of the road can easily cause traffic accidents because the automobile is out of control.The example given is of representation.

Key words: road surface resistance to slipping, traffic accident analysis, road surface maintenance