The Calhoun Street Bridge, linking Morrisville, Pennsylvania and Trenton, New Jersey, turns 150 years old this year. The Lincoln Highway went over this bridge.
- Bridge route connecting Morrisville and Trenton turns 150, Gema Maria Duarte, Bucks County Courier Times (Levittown, Pa.), July 11, 2011
- Calhoun Street route between NJ – PA turns 150, Brian Butko, Lincoln Highway News, July 14, 2011
