1) Bit of sign language 2) Brief street sign 3) Brief warning 4) Brief word of caution 5) Cal poly city 6) California university town 7) Caution to drivers 8) Cautionary road sign 9) Cautionary sign 10) Cautionary word on the road 11) Cautioning road sign 12) Construction-site sign 13) Curtailed road sign Found on https://www.crosswordclues.com/clue/slo