Thursday 26th November 1931

The first cloverleaf interchange to be built in the United States, at the junction of NJ Rt. 25 (now U.S. Rt. 1) and NJ Rt. 4 (now NJ Rt. 35) in Woodbridge, New Jersey, was featured on the cover of the Engineering News-Record. With their four circular ramps, cloverleaf interchanges were designed to let motorists merge from one road to another without braking. They worked well enough—and became so ubiquitous as a result—that writer Lewis Mumford once declared that “our national flower is the concrete cloverleaf.”