| 摘要 |
PROBLEM TO BE SOLVED: To perform automatic lighting of a hazard lamp at an appropriate timing according to a travelling circumstance.SOLUTION: A controller 21 performs, when deceleration α of a vehicle 1 is a prescribed threshold value or more, automatic lighting of a hazard lamp 2. The prescribed threshold value is varied according to a travelling circumstance. For example, the prescribed threshold value is changed, when visibility is worsened in a travelling circumstance such as during the night, to be a smaller value in comparison with the daytime on the basis of detection by an illuminance sensor or a headlight switch. The prescribed threshold value is changed, when brake performance is worsened in the travelling circumstance such as rainy weather, to be smaller value in comparison with travelling on the dry road on the basis of detection by the illuminance sensor or the headlight switch. |
