The one arm VEVA system is a movable crash barrier element that leads drivers to another part of the road, road lane, or road tunnel in the safest way possible. It can be fitted with or without a special buffer element (crash cushion).
With a one arm VEVA system you create a cross over in the median for redirecting your traffic.

Also the road workers or emergency services are well protected because of the  barrier having been tested in closed and open modus.