Solar-powered Model 400 barriers, with retractable steel bollards, can stop a 30,000-lb. vehicle traveling at speeds up to 50 m.p.h. Installed underground in sets of 3 or 4, posts are flush with roadway. With push of button, swipe of access card, or signal from radio controller or satellite, 1,400-lb. bollards spring upright. Reach full height of 36 ins. in 6 secs. or less. Each bollard has self-contained hydraulic pumps and integrated battery backup for tamper-resistance. Fully redundant design boasts no single point of failure, ensuring system will work even if 1 barrier fails. Ideal for remote locations.