23 C.F.R. § 661.37
What are the funding limitations on an individual TTF bridge project?
The following funding provisions apply in administration of the TTFBP:
(a) There are no funding limitations on an individual TTF bridge application, but the PE estimated cost will be based on the following fee scale:
Estimated Construction Cost:
(b) Requests for additional funds for PE or construction may be submitted along with proper justification to FHWA for consideration. The request will be considered on a case-by-case basis. There is no guarantee for the approval of the request for additional funds.