Abstract: A circular intersection notification device (100) includes: an experience value calculating unit (27) to calculate an experience value of the number of times of passage through a circular intersection or the number of times of notification of an approach to a circular intersection by counting the number of times of passage or the number of times of notification; an experience value determining unit (24) to, when a vehicle (1) approaches a to-be-passed-through circular intersection, determine whether the experience value calculated by the experience value calculating unit (27) is less than a threshold value; and a second notification controlling unit (25) to, when the experience value determining unit (24) determines that the experience value is less than the threshold value, perform control to notify a user currently driving the vehicle (1) of traffic rules at the to-be-passed-through circular intersection.

Abstract: Provided is a wrong-way-driving suppression device and the like for suppressing wrong-way-driving of a vehicle on a one-way road using existing map data and an onboard device or the like.

Abstract: Provided is a wrong-way-driving suppression device and the like for suppressing wrong-way-driving of a vehicle on a one-way road using existing map data and an onboard device or the like.

Abstract: In an information display device having a display screen and driven by receiving power supply from a battery, there is provided with a plurality of display patterns each of which the display range is reduced from a full screen display state displayed on the whole of the display screen, and the screen is switched to any one of the plurality of display patterns in accordance with a battery remaining capacity and a display content, and displayed.