Post, such as a roadside marking post, a traffic sign post or a lamp post

Abstract From the Canadian patent

A self-raising post of a plastic material such as PVC, for, use as a roadside marking post a traffic sign post, a lamp, post, or for other comparable uses in road traffic environments, has a channel-shaped bending zone with a substantially arcuate cross section and with the convex side facing the on-coming traffic. The cross-sectional area of the bending zone increases progressively towards the lower end, whereby the flaring-out zone (14) formed upon bending of the post will be larger below than above the line (11) of bending. The greater inherent resiliency of the material below than above the line of bending will cause the post to bend back into an upright position after having been hit …