Here's a little something that I haven't seen anywhere other than the hamlet of Avon-by-the-Sea in New Jersey.
It strikes me as a nice reminder to motorists that crosswalks are not for parking. Also discourages cars from driving down the yellow zone, as if it were a traffic lane. This particular crosswalk is right by the Avon Pavilion.
Here's a detail of the cone and the ring that holds the rail in place.
These pop-up railings are all over the place in Avon. Here's one that's closer to the Shark River.
And another angle. You can also see the little pylon in the middle of the street that reminds motorists to stop for a pedestrian in the crosswalk. Compliance is actually quite good on this street, which is called Ocean Avenue and is next to the boardwalk.
These little pop-up railings have a bunch of uses. Here is one that is separating people from a minor boardwalk repair in Asbury Park.
I was wondering whether these items might be useful around Philadelphia schools, during drop-off and pick-up. Yet another reminder to motorists that they should shift into school-zone mode.
See also A Poor Man's Bumpout.