Interstate 710

Route 710 (colloquially referred to as "The Seven-Ten"), consisting of State Route 710 (SR 710) and Interstate 710 (I-710), is a state highway in the Los Angeles area of the U.S. state of California, mostly built to interstate standards.

Interstate 710 is a north–south auxiliary interstate freeway running for 23 miles (37 km) through Los Angeles County, California. Officially known as the Long Beach Freeway, it runs north from Long Beach to Valley Boulevard, just north of I-10, the San Bernardino freeway, near the boundary between the cities of Alhambra and Los Angeles. South of I-5, Interstate 710 follows the course of the Los Angeles River, rarely wandering more than a few hundred feet from the riverbed. South of SR 1 in Long Beach, SR 710 is officially part of the Seaside Freeway.

Also called the Los Angeles River Freeway prior to November 18, 1954, I-710 was initially planned to run all the way north to Pasadena, but construction of the segment from Alhambra to Pasadena through South Pasadena has been delayed for several decades due to community opposition. Until this gap is constructed, the segment already completed from California Boulevard north to its northern terminus at State Route 134 and Interstate 210 remains unsigned.

Unconstructed state routes in Arizona

Below is a list and summary of the unconstructed state highways in the U.S. state of Arizona. Some are currently proposed while the others have been since cancelled prior to being constructed.

State Route 30

State Route 30 (formerly State Route 801), also known as the I-10 Reliever, is a planned state highway in the southwest parts of Phoenix, Arizona and nearby suburbs. It will connect the southern terminus of Loop 303 with the South Mountain leg of Loop 202. It is planned as a controlled-access freeway to relieve heavy traffic congestion experienced along Interstate 10 in the area.

State Route 50

State Route 50, also known as the Paradise Parkway, was a proposed urban freeway in Phoenix and Glendale. Originally proposed in the 1980s, the freeway would have run east to west, connecting State Route 51 and Loop 101, roughly parallel to and 4 miles (6.4 km) north of I-10, in the vicinity of Camelback Rd. As the proposed freeway would have crossed through largely developed land and densely populated neighborhoods, it proved to be both extremely expensive and highly unpopular. The route was eventually struck from state planning maps and all land acquired for right-of-way was subsequently sold, the funds being used to pay for other transportation projects.