A hidden hydraulic mechanism shuts the eyes of the sculpture for a second every hour in a single blink.

The brakes were now controlled using a hydraulic mechanism.

These replace the hydraulic mechanism of the conventional brakes and with electro-mechanically actuated brake calipers.

This eliminates the need for the user to actuate the hydraulic mechanism, saving effort and potentially increasing speed.

Retractable or rising bollards can be lowered entirely below the road surface (generally using an electric or hydraulic mechanism) to enable traffic to pass, or raised to block traffic.