Keep Left sign gives drivers explicit instructions for maintaining safety on the road and avoiding construction or other obstacles. Lyle-R4-8A-18HA
Standard: 01 The Keep Right sign shall not be installed on the right-hand side of the roadway in a position where traffic must pass to the left-hand side of the sign. 02 A narrow Keep Right (R4-7c) sign shall not be installed on a median island that has a width of 4 feet or more at the point where the sign is to be located.
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