Consist of two bollards either side of the driveway opening, traffic is controlled in a similar but slower fashion to a boom gate. Most common with a chain or cable which drops to the floor when activated for access
A bollard that is automated, installed below ground so that the bollard sits flush with the surrounding floor level when lowered. And rises to a typical bollard height when traffic restriction is required again.
As the name describes, is for pedestrian access only, can have automatic or sprung hydraulic closers fitted, together with electric or mechanical locks, cannot control the quantity of pedestrians accessing once opened.