as the Corona Del Mar Freeway. SR 73's previous alignment had the freeway portion end at MacArthur Boulevard, and the SR 73 designations ran along with MacArthur south to meet SR 1 in Corona del Mar. Under the current alignment, heading southbound, SR 73 becomes a designated toll road immediately after the Jamboree/MacArthur ramp and remains so until its southern terminus at I-5. Though the next ramp heading southbound (Bison Avenue) is part of the toll road, it is toll-free, as is the first ramp heading northbound from the southern terminus (Greenfield Drive). The design and construction of the highway cost a total of $800 million. The design and construction was overseen by the San Joaquin Hills Transportation Corridor Agencies, or SJHTCA, an agency formed in 1988 for the express purpose of designing the tollway. In the end, State Route 73 included 10 interchanges, 68 bridges, of retaining walls, and of excavation at completion. Construction was divided into four sections, each with an individual management system and quality control. A joint venture led by Kiewit Pacific Co., a subsidiary of Kiewit Corporation, completed this project in 1996. SR 73's toll road was the first to be financed with tax-exempt bonds on a stand-alone basis, including construction and environmental risk. In 2011, $2.1 billion in debt for the San Joaquin Hills toll roads was restructured, which pushed back the time until the bonds are paid off and the route becomes a state-owned freeway to 2042. In 2014, the debt was again restructured in an attempt to get improved interest rates, improved debt ratings, and in the process save $44 million in debt repayment. This resulted in another eight years of payments, delaying the pay-off date to 2050. Under this new plan the debt can be paid off earlier than 2050 if ridership and revenue improve. Tolls The tolled portion of SR 73 (beginning after Greenfield Drive in the northbound direction, and starting after the Bison Avenue exit in the southbound direction) employs a barrier toll system, where drivers are charged flat-rate tolls based on what particular toll booths they pass through. Since May 13, 2014, the road has been using an all-electronic, open road tolling system, and on October 2, 2019, the license plate tolling program, under the brand name "ExpressAccount", was discontinued. Drivers may still pay using the FasTrak electronic toll collection system or via a one time payment online.