A convertible, tilting vehicle , comprising: a pair of front wheels coupled to a tiltable chassis by a first mechanical linkage, wherein the pair of front wheels and the chassis are configured to tilt in unison with respect to a roll axis of the chassis ; a single rear wheel coupled to the chassis ; a motor coupled to the rear wheel and configured to drive the rear wheel to propel the vehicle ; a tilt actuator operatively coupled to the chassis and configured to selectively tilt the chassis ; a controller including processing logic configured to selectively control the tilt actuator to automatically maintain a net force vector applied to the chassis in alignment with a median plane of the chassis , wherein the net force vector is determined by gravity in combination with any applicable centrifugal force applied to the chassis ; and a rider support platform ; characterized in that the rider support platform is transitionable between: (a) a first mode, in which the rider support platform is configured to support a rider thereon and to steer the vehicle in response to rider input, and (b) a second mode, in which a portion of the rider support platform is displaced to a rider-unusable position, and the vehicle is steered by the controller; and wherein the vehicle further comprises a tilt-lock mechanism configured to selectively wedge the chassis into an upright orientation and the vehicle is configured to automatically engage the tilt-lock mechanism when the rider support platform is in the second mode. a pair of front wheels coupled to a tiltable chassis by a first mechanical linkage, wherein the pair of front wheels and the chassis are configured to tilt in unison with respect to a roll axis of the chassis ; a single rear wheel coupled to the chassis ; a motor coupled to the rear wheel and configured to drive the rear wheel to propel the vehicle ; a tilt actuator operatively coupled to the chassis and configured to selectively tilt the chassis ; a controller including processing logic configured to selectively control the tilt actuator to automatically maintain a net force vector applied to the chassis in alignment with a median plane of the chassis , wherein the net force vector is determined by gravity in combination with any applicable centrifugal force applied to the chassis ; and a rider support platform ; characterized in that the rider support platform is transitionable between: (a) a first mode, in which the rider support platform is configured to support a rider thereon and to steer the vehicle in response to rider input, and (b) a second mode, in which a portion of the rider support platform is displaced to a rider-unusable position, and the vehicle is steered by the controller; and (a) a first mode, in which the rider support platform is configured to support a rider thereon and to steer the vehicle in response to rider input, and (b) a second mode, in which a portion of the rider support platform is displaced to a rider-unusable position, and the vehicle is steered by the controller; and wherein the vehicle further comprises a tilt-lock mechanism configured to selectively wedge the chassis into an upright orientation and the vehicle is configured to automatically engage the tilt-lock mechanism when the rider support platform is in the second mode. <EOS>