FIGS. 19A to 19C and FIGS. 20A to 20C schematically illustrate a screen of prior notice displayed respectively at the first and second display devices 3, 4 in advance in a case that the own vehicle during travelling on a cruising lane 66 with automated driving makes a U-turn to an opposing lane 67 as being deviated from the scheduled travel course 37. First, a symbol image 68 indicating a travel course for the U-turn is displayed at the first display device 3 in addition to the symbol image 37 indicating the scheduled travel course. Similarly, a symbol image 68′ indicating the travel course for the U-turn is displayed as well at the second display device 4 in addition to the symbol image 37′ indicating the scheduled travel course.