I just added some max_speed= tags for #OpenStreetMap in Bloomington, Indiana.
Our city code has a default speed limit 25 mph. Exceptions are published in a table in the city code.
It seems possible that adding the correct lower-than-default speed limits from city code to OpenStreetMap could reduce the likelihood that routing algorithms would route car traffic there, which could in turn keep the street safer for other road users.
Ref: https://library.municode.com/in/bloomington/codes/code_of_ordinances?nodeId=TIT15VETR_CH15.24SPRE
Sorry, then I misread.
@superkret I filled in some missing values based on correct values found in city code.