This is an example of the bright yellow metal plates that our city puts in the cut out portion of the curb meant for wheelchair users. The bumps slow the wheelchair down a bit, and the yellow shows everyone that the curb is cut out to be a slope from the sidewalk down to the road. In addition, these proved helpful to my husband in the last few years of his life when he was legally blind. He still had a small circle of vision in one eye, but could only look one place at a time (straight forward, down to his shoes, etc.). He thus could either look where he was going, or down at the sidewalk. He obviously chose to look where he was going, As he approached a cut out curb, the texture of the bumps that he could feel both with his feet, and with his white cane, warned him that he was coming to a road and had to stop. They were of great help.
A few weeks ago I was in a very large parking lot with a lot of sidewalks in front of shops, and I noticed that there seemed to be these yellow plates all over. It seemed to be a photo opportunity for Becky’s challenge of October lines&squares. And bumps.