Route 29 begins at a modified cloverleaf interchange with Interstate 195 and Interstate 295 in Hamilton Township , and it serves as the western continuation of Interstate 195 , heading to the northwest as a six @-@ lane freeway . The route interchanges with Route 129 , a spur of Route 29 which connects to U.S. Route 1 , at a partial interchange with a northbound exit and southbound entrance . Route 29 narrows to four lanes past this interchange and crosses into Trenton . The route comes to a southbound exit and entrance for Lamberton Road . At this point , Route 29 becomes the Delaware River Scenic Byway , a state scenic byway that was also designated a National Scenic Byway in 2009 . Route 29 runs along the bank of the Delaware River and enters a truck @-@ restricted tunnel that passes by historic houses and Riverview Cemetery . Within this tunnel , Route 29 features a southbound exit and northbound entrance for Lalor Street . The route emerges from the tunnel as the John Fitch Parkway , passes by Arm & Hammer Park , and comes to a traffic light at Thunder Road / Cass Street where it widens back to six lanes . Route 29 meets South Warren Street at another traffic light . The median widens and it passes under the Morrisville @-@ Trenton Railroad Bridge , which carries the Amtrak Northeast Corridor over the Delaware River .