We are offering automatic road blockers.Key features. Standard widths from 1.5m to 4m can be customised to any specific dimension.. Above ground control unit houses hydraulic and electronic systems for ease of maintenance.. High quality polyester powder coated frames.. High safety mergin crash ratings.. Programmable control system for complete flexibility.. Line or off line mode, optionl.. The series 500 range of road blockers has been designed for situations where it is imperative that unauthorised vehicles are stooped or where barriers do not provide a high enough deterrence.