The oldest road sign

The brake stone, the so-called shell, is one of the oldest traffic signs, dating back to the 18th century. Only a few have survived in the Czech Republic. It is a quadrilateral stone in which wedges are marked. These iron wedges were also found at the road sign, when forman put these wedges on the rear wheels to brake his carriage by sliding down the hill. The one who then went up loaded these wedges and drove them up. The sign was always to the left of the road, because until 1939 we drove to the left.