To prevent an accident such that a farm working machine runs on a furrow during automatic straight drive without increasing sensors or the like.
A front and after direction inclination sensor 23 or a vehicle speed sensor 26 which is generally equipped a farm working machine with is used. When the front and after direction inclination sensor 23 detects front and after direction inclination of a machine body greater than a predetermined angles, a control device controls to stop travelling. When the vehicle speed sensor 26 detects that vehicle speed drops to lower than a predetermined speed, the control device controls to stop travelling. The above mentioned control can be stopped by a control stopping means 18, and the vehicle body can intentionally run on the furrow at departure from a field.
KUSAMOTO HIDEYUKI
TOKUDA SATORU
