A steering unit for a vehicle, notably a bus. The steering unit is coupled with a suspension system and comprises: a support formed by a passenger platform and a wheel housing, a longitudinal axis, a steering knuckle with an in-wheel engine defining a transversal rotation axis which is arranged transversally with respect to the longitudinal axis, an actuator mechanism adapted for pivoting the steering knuckle. The steering knuckle further comprises a lever which is linked to the actuator mechanism and which includes a transversal portion extending transversally along the in-wheel engine. The steering unit is adapted for an articulated bus with at least two bodies, said bodies each exhibits four or eight identical and independent steering units.