23 C.F.R. § 661.51

Can TTFBP funds be used for the approach roadway to a bridge?

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Yes, costs associated with approach roadway work, as defined in § 661.5 are eligible. Long approach fills, causeways, connecting roadways, interchanges, ramps, and other extensive earth structures, when constructed beyond an attainable touchdown point, are not eligible uses of TTFBP funds.