U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
A: The HSIP Final Rule does not specify how agencies obtain AADTs. Agencies may make their own determination about how they obtain AADTs, whether by actual count or by some estimation method (e.g., assignment-based similarities in location and function) or some combination of the two. We recommend that agencies apply or adapt current traffic monitoring approaches, as documented in FHWA's Traffic Monitoring Guide, to obtain AADT estimates for roadways covered by the HSIP Final Rule that are not part of their current traffic monitoring effort.
A: All intersections with at least one of the roads functionally classified as non-local require the collection of MIRE FDE. This would include inventorying non-local/non-local intersections as well as non-local/local intersection. Only local/local intersections do not require MIRE FDE.