An extremely easy to handle barrier turning through 360° with manual opening, usable also on paving with undulations or roughness, with a double joint inclination adapter which permits installation also on roads with an inclination greater than 10%, so as to keep the barricade in a vertical position with the barrier closed. It has a double blocking system: laterally to the wheel and on the rotation pin. Available with from one to four modules with different designs. Arranged for housing optional box section aluminium sign and terracotta tubs.