If you want to have security levels same to automatic bollard. But the budget is limited. Semi-auto bollard is a best choice.
Semi-auto bollard is lifted up by gas spring which is built-in. It is normally suitable for access control system for higher security demand but low vehicle flow. As the safety requirement increases, the bollard size becomes larger. Under such circumstance, the unique air pressure assistant system of Delos semi-automatic bollard is able to afford more load.