A method of controlling a tractor/baler combination includes advancing a tractor/baler combination through a swath or windrow of a harvested crop material with a tractor PTO operating at a constant speed to power a drive of a baling chamber of the baler and the baler operating to pick up harvested crop material; assessing the flowrate of the harvested crop material in the baler and the torque of the baling chamber drive; comparing the flowrate with an optimal flowrate and the torque of the baling chamber drive with an optimal baling chamber drive; and, if the assessed flowrate differs from the optimal flowrate or the assessed torque of the baling chamber drive differs from the optimal torque by more than a predetermined amount, changing the speed of advancement of the tractor/baler combination, and changing the flowrate in the baler and the torque of the baling chamber drive.

An industrial vehicle includes a driving device, a travel control device configured to control the driving device, an object detection unit, a first control unit setting a limit value, when a vehicle speed of the industrial vehicle is in a first vehicle speed range, a second control unit setting the limit value when the vehicle speed of the industrial vehicle is in a second vehicle speed range, and a speed limit unit imposing the speed limit according to the limit value. The first control unit includes a starting prohibition control unit that sets the limit value and a starting permission control unit that sets the limit value. The speed limit unit imposes the speed limit according to the limit value set by the first control unit when the limit value is set by the starting permission control unit.

An industrial vehicle includes a driving device, a travel control device configured to control the driving device, an object detection unit, a first control unit setting a limit value, when a vehicle speed of the industrial vehicle is in a first vehicle speed range, a second control unit setting the limit value when the vehicle speed of the industrial vehicle is in a second vehicle speed range, and a speed limit unit imposing the speed limit according to the limit value. The first control unit includes a starting prohibition control unit that sets the limit value and a starting permission control unit that sets the limit value. The speed limit unit imposes the speed limit according to the limit value set by the first control unit when the limit value is set by the starting permission control unit.