Sep 24, 2025
Did you know? The first cloverleaf interchange opened in New Jersey in 1929
The first cloverleaf interchange was built in Woodbridge, New Jersey, USA, and opened in 1929. It was designed to allow two major highways (Routes 25 and 4, now US 1 and US 9) to cross without traffic signals. The design used four loop ramps in each quadrant, enabling drivers to make left turns by circling around, eliminating dangerous cross-traffic. Although revolutionary at the time, cloverleaf…