A vehicle control system comprising: a rotatable steering input device; a speed control device; a first speed input member coupled to the speed control device such that movement of the speed control device to cause forward vehicle movement causes rotational movement of the first speed input member, the first speed input member comprising a curved cam slot; a link coupled to the rotatable steering input device through a steering shaft, where rotational movement of the rotatable steering input device causes rotational movement of the steering shaft and substantially lateral shifting of the link; a first steering input gear coupled to the link such that substantially lateral shifting of the link causes rotational movement of the first steering input gear; a first steered gear engaged with the first steering input gear such that rotational movement of the first steering input gear causes rotational movement of the first steered gear; a first front wheel yoke coupled to the first steered gear and to a first steerable wheel such that rotational movement of the first steered gear causes the first steerable wheel to turn; a first flexible cable coupled to the steering input gear; a control member coupled to the first flexible cable; and a first integration link coupled to the control member and to a first drive unit; where movement of the control member causes movement of the first integration link relative to the curved cam slot of the first speed input member, and where rotational movement of the first speed input member responsive to movement of the speed control device to cause forward vehicle movement causes movement of the first integration link and movement of a control mechanism of the first drive unit. a rotatable steering input device; a speed control device; a first speed input member coupled to the speed control device such that movement of the speed control device to cause forward vehicle movement causes rotational movement of the first speed input member, the first speed input member comprising a curved cam slot; a link coupled to the rotatable steering input device through a steering shaft, where rotational movement of the rotatable steering input device causes rotational movement of the steering shaft and substantially lateral shifting of the link; a first steering input gear coupled to the link such that substantially lateral shifting of the link causes rotational movement of the first steering input gear; a first steered gear engaged with the first steering input gear such that rotational movement of the first steering input gear causes rotational movement of the first steered gear; a first front wheel yoke coupled to the first steered gear and to a first steerable wheel such that rotational movement of the first steered gear causes the first steerable wheel to turn; a first flexible cable coupled to the steering input gear; a control member coupled to the first flexible cable; and a first integration link coupled to the control member and to a first drive unit; where movement of the control member causes movement of the first integration link relative to the curved cam slot of the first speed input member, and where rotational movement of the first speed input member responsive to movement of the speed control device to cause forward vehicle movement causes movement of the first integration link and movement of a control mechanism of the first drive unit.