What Are Those Yellow Painted Circles on Some San Francisco Streets?

You’ve likely seen them all over town: those yellow circles painted at seemingly random locations in the middle of the street. Some of them are ordinary circles, others have a little notch or arm poking out, while still others have an unpainted section across their middle, looking like the top of a flathead screw. They’re roughly the same goldenrod hue as a school bus.
But what are they? Senior Editor Astrid Kane explains-read their full article here: sfstandard.com/2023/10/09/san...
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[@celebrityrog]

They’re bus directions for overhead wires locations and the markers tell them when and where the bus needs to move the electrical pantograph.

[@RaymondHng]

Electric trolleybuses do not have pantographs. They have trolley poles. The painted circles help drivers time their acceleration properly as buses pass through the “breakers” that connect different sections of wire. If the driver incorrectly applies power while driving over the circles, a huge electric spark occurs as the trolley shoe breaks contact with one set of wires and makes contact with the next set of wires.