Keywords: MUTCD S4-5 METRIC (old).svg Old version of File MUTCD S4-5 METRIC svg before the MUTCD required all school zone signs to use a fluorescent green backing MUTCD_S4-5 svg MUTCD_S5-1_METRIC svg 50 2012-10-04 00 55 UTC MUTCD_S4-5 svg MUTCD_S5-1_METRIC svg Federal Highway Administration - MUTCD derivative work Fry1989 Diagrams of school road signs of the United States Diagrams of old road signs of the United States SVG USA road signs in metric units Speed limit ahead road signs Diagrams of metric speed limit signs of the United States Road signs in the United States using the metric system Diagrams of 30 km/h speed limit road signs |