Specifications include, but are not limited to: Rotary mowers shall normally be utilized in the mowing of the right-of-way; however, sickle mowers, side mounts, flail, or boom mowers may be used to mow around bridges, culverts, sign posts, mailboxes, delineators, flex beam guardrails, wet areas, ditches, etc., as approved by the Engineer. Other types of grass-cutting equipment may be used, provided it has been approved by the Engineer prior to use. All rotary mowers must be equipped with safety chains to prevent damage to property by flying debris from under the mower. Chains shall be a minimum of three eights inches (3/8") in size and links spaced side by side around the mower's front and sides and long enough to drag the ground at all times during mowing operations. On the rear of the mower, the length of the chains shall be as directed by the Engineer. Maximum cutting widths for rigid frame rotary mowers shall be one hundred eight inches (108"). Hinged or batwing mower cutting widths shall be as approved by the Engineer. Boom mounted or side cut rotary mowers may be required to cut roadside ditches, laterals and any other area nor readily accessible to standard mowing equipment. Hand trimming shall be required in some areas. All mowers shall be kept in good operating condition and shall be maintained to provide a clean sharp cut of vegetation at all times.