From here, Route 43 continued east on what is now SR 91 towards Riverside. It was built from the southern terminus of SR 1 (the Pacific Coast Highway, or "PCH") and continued northbound on roughly the same route it follows today, following Newport Road (today Newport Boulevard) northeast to Tustin, and then Tustin Avenue north to near its current terminus at SR 91. SR 55 was built in 1931 and originally numbered Route 43. SR 55 southbound at I-405 interchange in Costa Mesa SR 55 from SR 91 to Costa Mesa is known as the Costa Mesa Freeway, as named by Assembly Concurrent Resolution 177, Chapter 86 in 1976. SR 55 is part of the California Freeway and Expressway System, and is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. However, congestion is still very prevalent throughout the day, as is the norm with many Orange County freeways Route 55 experiences a peak daily traffic volume of 262,000 vehicles and 17,292 trucks. A HOV lane has been built along the entire freeway portion from I-405 to SR 91, with some direct access ramps, including one for I-5. Today, SR 55 is a heavily travelled corridor linking southern Orange County with SR 91, the main corridor between the Inland Empire and the Los Angeles Metropolitan Area, as well as I-5, the main north–south corridor for California. After the last exit, Lincoln Avenue and Nohl Ranch Road, there is an entrance to the 91 Express Lanes from the HOV lane. Following this, the freeway continues almost due north until reaching its northern terminus at SR 91 near the Santa Ana River. SR 55 continues north into Orange, where it meets the eastern terminus of SR 22. Southbound SR 55 does not have a direct link to northbound I-5. The freeway continues north into Santa Ana and Tustin, where there is an interchange with I-5. SR 55 intersects SR 73 and I-405 next to John Wayne Airport. North of Fair Drive, SR 55 is an at-grade or above-grade freeway, with the exception of a 1 mile (1.6 km) stretch between the 1st Street/4th Street exit and the 17th Street exit in Santa Ana, which is below-grade. Following the 19th Street intersection, SR 55 becomes an eight-lane below-grade freeway that bisects the northbound and southbound lanes of Newport Boulevard until the Mesa Drive undercrossing. The segment on Newport Boulevard includes a limited-access interchange at SR 1. It then follows a traditional street routing through a retail and commercial section of Costa Mesa until its intersection with 19th Street. Starting at Via Lido on Newport Boulevard in Newport Beach, 0.3 miles (0.48 km) south of SR 1, SR 55 (Newport Boulevard) is a four-lane expressway for approximately 0.75 miles (1.21 km) to its intersection with 17th Street in Costa Mesa. SR 55 received the first carpool lane in Orange County in 1985, and the first direct carpool ramp in 1995. Due to congestion, several alternatives are being discussed to expand the freeway portion past its current end in Newport Beach. It was renumbered SR 55 in 1959, and the construction of the freeway portion began in the 1960s and continued until 1992. SR 55 was first added to the state highway system in 1931, known as part of Legislative Route 43, and was routed on surface streets. SR 55 runs between Via Lido south of Pacific Coast Highway (SR 1) in Newport Beach and the Riverside Freeway (SR 91) in Anaheim to the north, intersecting other major Orange County freeways such as SR 22, SR 73, and Interstate 405 (I-405). The portion of the route built to freeway standards is known as the Costa Mesa Freeway (formerly the Newport Freeway). State Route 55 ( SR 55) is an 18-mile (30-km) long north–south state highway that passes through suburban Orange County in the U.S.
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