Headlamp control systems

A motorcycle including a variable length front suspension having upper and lower relatively displaceable sections, a headlamp pivotally mounted on said upper section, said headlamp being adjustable by pivotal movement about an axis substantially perpendicular to the optical axis of the headlamp, front and rear detector elements respectively adapted to detect the relative positions of said upper and lower relatively displaceable sections and the relative position of a rear part of the motorcycle in relation to the rear wheel, the front detector element comprising a ramp rigidly fixed to said lower displaceable section and having a ramp surface which is inclined to the direction of displacement of said upper and lower sections, a hydraulic control circuit, and front and rear hydraulic control devices repeatedly coupled to the two detector elements, the front hydraulic control device including a lever mounted to rotate about a horizontal pivot rigidly connected to said upper displaceable section, the lever having a portion thereof which cooperates with said ramp surface in such a manner that relative displacement of said upper and lower sections results in displacement of fluid in said hydraulic control circuit, and actuating means adapted to pivot said headlamp about an axis substantially perpendicular to the optical axis of the headlamp in response to said displacement of fluid.