Vehicle with normal and differential steering modes

A vehicle configured to operate in a normal steering mode and a differential steering mode, the vehicle comprising;

• a first, second, third, and fourth wheel with the first and second wheels disposed on opposite sides of the vehicle and with the third and fourth wheels disposed on opposite sides of the vehicle;
• a first and second motor, each independently controllable by a motor controller to rotate at varying rotational speeds, with the first motor driving the first wheel and the second motor driving the second wheel;
• a steering wheel connected by a steering shaft to a steering mechanism to change the angle of travel of either the first and second wheels or the third and fourth wheels when the vehicle is operating in the normal steering mode;
• a steering lock mechanism to lock the steering mechanism and thereby lock the angle of travel of the wheels, whose angle is otherwise changed by the steering mechanism when the vehicle is operating in the differential steering mode;
• a sensor for sensing the direction the steering wheel is turned, at least when the vehicle is operating in the differential steering mode;
• wherein, when the vehicle is operating in the differential steering mode, a signal from the sensor is received by the motor controller, whereupon the motor controller causes the first and second motors to rotate the first and second wheels at different rotational speeds to thereby turn the vehicle in the same direction the steering wheel is turned.