Road surface management system

A road surface management system for managing the road surface condition of traveling lanes for dump trucks (2) used in quarries or construction sites, comprising:

• suspension state quantity detection means (20A-20D) which detect state quantities of four suspensions (18L, 18R, 19L, 19R) provided corresponding to the left front, right front, left rear, and right rear wheels (10L, 10R, 11L, 11R) of each dump truck (2);
• position acquisition means (7B) which acquires the position of the dump truck (2);
• traveling speed detection means (12) which detects the traveling speed of the dump truck (2);
• traveling judgment means (25) which judges that the dump truck (2) is traveling if the traveling speed of the dump truck (2) detected by the traveling speed detection means (12) is higher than or equal to a preset threshold value;
• suspension state quantity judgment means (25) which judges whether each of the state quantities of the four suspensions (18L, 18R, 19L, 19R) detected by the suspension state quantity detection means (20A-20D) is within a reference range which has been set for each suspension or not in regard to each position of the traveling dump truck (2);
• road surface condition judgment means (25) which judges that the road surface at the position of a dump truck (2) is in a poor condition if one of the state quantities of the four suspensions (18L, 18R, 19L, 19R) of the dump truck is judged to be outside the reference range and the remaining three state quantities are judged to be within the reference range;
• and
• display means (17A;
• 17B;
• 17C) which displays the positions of the road surfaces judged by the road surface condition judgment means (25) to be in the poor condition.