Vehicle and vehicle controller

A vehicle allowing an autonomous driving kit to be mounted thereto, the vehicle comprising:

• a vehicle control interface box;
• and
• a vehicle system,
• the vehicle system including a brake device configured to decelerate the vehicle,
• the vehicle control interface box being configured to send a prohibition signal to the autonomous driving kit while the vehicle is located on a steep slope, the prohibition signal indicating that brake hold by the brake device is prohibited,
• the vehicle control interface box being configured to switch a manual mode to an autonomous mode and vice versa in response to a request received from the autonomous driving kit, the manual mode being a mode in which the vehicle system is under control of a user, the autonomous mode being a mode in which the vehicle system is under control of the autonomous driving kit,
• the vehicle control interface box being configured to continue the manual mode in spite of the autonomous driving kit requesting the vehicle control interface box to switch the manual mode to the autonomous mode while the vehicle is driven in the manual mode and also located on the steep slope.