According to MUTCD Chapter 3C—Type 1, 2, and 3 Object Markers must be installed at least 4 feet above the ground measured from the bottom of the sign. There may be situations when the obstruction may require the sign to be mounted higher or lower too. Like, when used for marking objects in the roadway or objects that are 8 feet or less from the shoulder or curb, the mounting height should be at least 4 feet “above the surface of the nearest traffic lane.” End-of-Roadway markers too have at least a 4 feet minimum space requirement from the bottom of the diamond-shaped object marker to the edge of the pavement.