During the development of the Interstate Highway System, New Jersey and Pennsylvania considered having I-95 cross over the Trenton–Morrisville Toll Bridge, and continue north on the existing US 1. The project was opposed due to inadequate highway standards (lack of shoulder ramps, and only two lanes in each direction). During this time, both states sought alternate routes for the proposed I-95. In 1960, New Jersey and Pennsylvania decided to designate the Scudder Falls Bridge as I-95. By 1969, an extension of the Trenton Freeway from the current left-hand exit to US 1 Business/US 206 to Whitehead Road was completed and received the Route 174 designation.