A hair appliance includes a handle, an electrical component coupled with the handle, and a switch mechanism in electrical communication with the electrical component and a power source. The electrical component has a plurality of settings. The switch mechanism includes a switch and a rotatable adjustment member. The switch has multiple positions and includes a sliding actuator. Each position corresponds to a respective setting for the electrical component. The rotatable adjustment member includes a contact surface operatively coupled with the sliding actuator such that rotational movement of the rotational adjustment member results in translational movement of the sliding actuator.

In order to provide a fail-safe operating mode during a transition between an autonomous steering mode and a driver-controlled steering mode in an emergency situation, a steering system comprises a steering shaft, a brake mechanism movable between an released position and a engaged position for angularly locking the steering shaft, and an override such that a non-destructive external torque applied to the steering shaft above a given threshold when the brake mechanism is in the engaged position results in a rotation of the steering shaft.

In order to provide a fail-safe operating mode during a transition between an autonomous steering mode and a driver-controlled steering mode in an emergency situation, a steering system comprises a steering shaft, a brake mechanism movable between an released position and a engaged position for angularly locking the steering shaft, and an override such that a non-destructive external torque applied to the steering shaft above a given threshold when the brake mechanism is in the engaged position results in a rotation of the steering shaft.