以stop sign為圓心劃一個３０英尺的圓圈，圈內不能停車，不管車裏是否有人。

Standing or parking a vehicle, whether occupied or not, is prohibited:
? In front of a public or private driveway.
? Within 15 feet of a fire hydrant.
? Within 20 feet of a fire station driveway or crosswalk at an intersection.
? Within 30 feet of a STOP sign, YIELD sign or traffic control signal.

http://www.cyberdriveillinois.com/publications/pdf_publications/dsd_a112.pdf