or that Tesla used software to measure them to determine stopping distance and speed
https://www.thedrive.com/news/teslas-can-be-tricked-into-stopping-too-early-by-bigger-stop-signs
or that Tesla used software to measure them to determine stopping distance and speed
https://www.thedrive.com/news/teslas-can-be-tricked-into-stopping-too-early-by-bigger-stop-signs
Size of signs are determined by traffic speeds & location. the smallest signs would be used on cart paths & maybe narrow low speed urban roads and larger signs on roads with higher design speeds. If anyone is actually interested -the FHWA supplies a remarkably thorough guide called the Manual on Uniform Traffic Control Devices (MUTCD) the part specific to to sign design is located: https://mutcd.fhwa.dot.gov/pdfs/2009r1r2r3/part2a.pdf
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