Speed limit signs are usually located immediately after a major intersection on the right side. Keep in mind that the Basic Speed law requires that you never drive faster then road and/or weather conditions allow regardless of the posted speed limit. Common speed limits are: Residential, School/Playgrounds, Business, and Construction zones are 25 MPH unless otherwise posted. Blind, Uncontrolled Intersections/Railroad Crossings, and Alleyways are always 15 MPH.