Code of Federal Regulations Title 23. Highways § 23.650.707 Rating factor

(1) SR is Sufficiency Rating computed as illustrated in appendix A of the Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation's Bridges, USDOT/FHWA (latest edition);  (If SR is less than 1.0, use SR=1.0);

(2) ADT is Average Daily Traffic in thousands taking the most current value from the national bridge inventory data;

(3) ADTT is Average Daily Truck Traffic in thousands (Pick up trucks and light delivery trucks not included). For load posted bridges, the ADTT furnished should be that which would use the bridge if traffic were not restricted. The ADTT should be the annual average volume, not peak or seasonal;

(4) N is National Highway System Status. N=1 if not on the National Highway System. N=1.5 if bridge carries a National Highway System road;

(5) The last term of the rating factor expression includes the State's unobligated balance of funds received under 23 U.S.C. 144 as of June 30 preceding the date of calculation, and the total funds received under 23 U.S.C. 144 for the last four fiscal years ending with the most recent fiscal year of the FHWA's annual call for discretionary bridge candidate submittals;  (if unobligated HBRRP balance is less than $10 million, use zero balance);

(6) TPC is Total Project Cost in millions of dollars;

(7) HBRRP is Highway Bridge Replacement and Rehabilitation Program;

(8) ADT' is ADT plus ADTT.