23 C.F.R. § 490.513
Where:
R = total number of Interstate System reporting segments that are exhibiting an LOTTR below 1.50 during all of the time periods identified in § 490.511(b)(1)(i) through (iv) ;
I = Interstate System reporting segment "i";
SLi = length, to the nearest thousandth of a mile, of Interstate System reporting segment "i";
AVi = total annual traffic volume to the nearest single vehicle, of the Interstate System reporting segment "i";
J = geographic area in which the reporting segment "i" is located where a unique occupancy factor has been determined;
OFi = occupancy factor for vehicles on the NHS within a specified geographic area within the State/Metropolitan planning area; and
T = total number of Interstate System reporting segments.
Where:
R = total number of non-Interstate NHS reporting segments that are exhibiting an LOTTR below 1.50 during all of the time periods identified in § 490.511(b)(1)(i) through (iv) ;
i = non-Interstate NHS reporting segment "i";
SLi = length, to the nearest thousandth of a mile, of non-Interstate NHS reporting segment "i";
AVi = total annual traffic volume to the nearest 1 vehicle, of the Interstate System reporting segment "i";
j = geographic area in which the reporting segment "i" is located where a unique occupancy factor has been determined;
OFj = occupancy factor for vehicles on the NHS within a specified geographic area within the State/Metropolitan planning area; and
T = total number of non-Interstate NHS reporting segments.
Where:
(Tailpipe CO2 Emissions on NHS)CY = total tailpipe CO2 emissions on the NHS in a calendar year (expressed in million metric tons (mmt), and rounded to the nearest hund redth); and
(Tailpipe CO2 Emissions on NHS)reference year = total tailpipe CO2 emissions on the NHS in calendar year 2022 (expressed in million metric tons (mmt), and rounded to the nearest hundredth).
23 C.F.R. §490.513