Generally, most of the agricultual tractors are equipped with a 4-Wheel-Drive (4WD) feature to get maximum traction. Indeed,the 4WD feature is maximum traction, but it also spoils the turning ability, especially it becomes very difficult to make tight turns. This means that the performance of work is spoiled in some situations as follows: (1) In a case when the tractor has to till the soil next to the previously tilled lane. (2) In a case when the tractor has to mow around the bases of trees or some other obstacles. (3) In a case when the tractor with a front loader has to change directions in a narrow space. Because of these problems, we researched and developed the “BI-SPEED TURN” feature to improve on these disadvantages.This feature can be used whenever the steering angle of the front wheel exceeds approximately 25 degrees, the front wheels automatically start turning nearly twice as fast. The result is the tractor can make tight turns smoothly.