| 摘要 |
PROBLEM TO BE SOLVED: To timely provide information that a driver really desires to know.SOLUTION: Arithmetic parts 23 and 25 detect the traffic state (congestion degree, block required time, or the like) of a road being the object of monitoring, by inputting sensor data detected by a vehicle detector 9. A graphic provision information creation part 29 is provided with a plurality of graphic information displayed on a road information board and configured, to create at least the picture of normal provision content display and the picture of event occurrence time provision content display, on the basis of the graphic information and a traffic state detected by the traffic state detection means. Check processing parts 26 and 27 compares the detected traffic state with a predetermined determination reference, and determines whether content displayed on a road information board 11 is pertinent to normal provision content display created by the graphic provision information creation part 29 or the event occurrence time provision content display. A graphic information control part 31 controls whether to execute the normal provision content display or execute the even occurrence time provision content display to the road information board 11, according to the determination result. |
