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C . All castings shall be manufactured true to pattern and with a close fit of <br /> component parts . Frames and covers in roadway and traffic areas shall be of <br /> non-rocking design or shall have machined bearing surfaces so that fitting <br /> parts will not rattle or rock under traffic . <br /> D . All grates , frames and covers located within road right-of- way or traffic areas <br /> shall be capable of withstanding the AASHTO 1-1-20 vertical , dynamic <br /> wheel load. <br /> C : \ Download \ techspec - 02402 . doc 02902 - 2 <br />