the NEW Ridgeback™ Speed Ramp is designed to reduce vehicle speed and improve safety conditions in residential and commercial areas » effective interlocking system for easy connectivity and maintains stability before and after assembly » increased area of reflectivity compared to traditional styles of speed ramp » innovative approach of using thermoplastic retro-reflective elements with glass beads for improved visibility » the latest high performance polymer technology conforms to requirements of BS EN 1436:2018 and durability requirements of BS EN1824:201 » ramp options: 5cm reduce speed to a maximum of 16kph » 7.5cm reduce speed to a maximum of 8kph; dimensions: H 5 cm / L 20 cm / W 40 cm.