822.4 Type III Management Area Guidelines (Undeveloped Areas on Divided Highways)
These areas include all undeveloped areas on divided highways. The height of the vegetation should be maintained between 6 and 18 inches. Mowing should begin when 50 percent of the vegetation reaches 18 inches in height.
Slopes steeper than 3 to 1 and areas not required to be mowed should be planted to wildflowers and native grasses, encouraged to naturalize or landscaped.
Medians
Vegetation control (PGR or mowing) should be done on all medians less than 100 feet in width. Medians 100 to 150 feet in width may be managed at the district's discretion and is dependent on the type of terrain. When the median is over 150 feet in width, vegetation control may be completed out to a distance of 30 feet from the edge of the nearest traveled way. This is intended to be one pass with the type of equipment used.
Interchanges
Mowing interchanges requires a large resource commitment. Each interchange should be evaluated as to the extent of vegetation control needed. Vegetation control (PGR or mowing) may be done on the interior of interchanges, if necessary, where slopes are 3 to 1 or flatter. It may extend to 30 feet from the edge of the nearest traveled way. This is intended to be one pass with the type of equipment used.
Main Roadway
Vegetation control (PGR or mowing) along the outside shoulder may be completed out to a distance of 30 feet from the edge of the nearest traveled way. This is intended to be one pass with the type of equipment used. Do not leave a narrow strip (less than 30 feet) between the main roadway and outer roads.
