The southern portion of Route 125 from Route 905 to Route 54 near Chula Vista is a toll road called the South Bay Expressway. It is California's first road built as a public/private partnership. The toll road is being funded by the private company California Transportation Ventures, Inc. and the following public agencies: the United States Department of Transportation, Caltrans, San Diego Association of Governments (SANDAG), and the City of Chula Vista.
The toll road's name is quite unusual, as it is built to freeway standards and therefore should be labeled a freeway under both California and federal law. See freeway and expressway for more information on the difference between the two.
Route 125 was originally planned to continue north through East Miramar to Poway to connect with State Route 56 and Select Arterial 680 but Poway successfully blocked that by insisting Caltrans upgrade State Route 67 instead, leaving the northern terminus at State Route 52. There still are proposals to connect it to Scripps Poway Parkway, or to take it all the way up to Riverside parallel to Interstate 15, creating a third full north/south freeway for San Diego. It is currently unlikely that will ever happen though.
In the early 1990s, only the section south of Interstate 8 and north of State Route 94 was completed; confusingly, it was signed as State Route 94, even though it met with both westbound and eastbound Route 94 at its southern terminus. The Route 125 signs later replaced the Route 94 signs, although at the Interstate 8 a "TO" referring to Route 94 is carried on the signs for Route 125 South.
The northernmost portion of the current Route 125 was built in stages. For a time, its northern terminus was at the current exits for Fletcher Parkway, then later at Navajo Road, although passage through the construction zone to Grossmont College Drive was possible via Fanita Drive, the street which was replaced by the freeway construction (which remained open throughout its conversion to a freeway). The northernmost portion (north of Grossmont College Drive) was completed to State Route 52 and Mission Gorge Road while the portion between Navajo Road and Grossmont College Drive was still under construction. As of 2005, this section has been completed.
In the early 2000s, further construction resulted in the third section of Route 125, connecting southward from State Route 94 to State Route 54. As of early 2006, the interchange at Routes 125 and 54 is still under construction (as a portion of the construction of the fourth portion of Route 125, mentioned below), but traffic can pass along a four-lane detour through the construction zone. This allows southbound traffic on Route 125 to continue to westbound State Route 54, while eastbound State Route 54 continues northbound on Route 125.
The fourth section, the South Bay Expressway toll road, opened on November 19 2007, extending Route 125 southward from State Route 54 to Otay Mesa. It was designed as a toll road due to the lack of available funds from a 1/2 cent sales tax, which was set to expire in 2008. In 2004, the voters of San Diego County voted to extend the 1/2 cent sales tax to 2028 , this making more funds available to fund this project, and other projects in this region, calling into question the purpose of the toll road designation of this roadway. The toll road is equipped with both cash and electronic toll collection equipment, the electronic equipment being the FasTrak RFID ststem used elsewhere in California.
|San Diego||1||Southbound exit and northbound entrance|
|Otay Mesa toll plaza|
|Chula Vista||5||Birch Road|
|7||Otay Lakes Road|
|8||East H Street|
|9||Mt. Miguel Road||Southbound exit and northbound entrance|
|North end of toll road|
|9.90||12||Jamacha Boulevard, Paradise Valley Road (CR S17)|
|Lemon Grove||12.97||15||Southbound exit to SR 94 east is via exit 17A|
|13.50||17A||Spring Street – La Mesa||Northbound exit is via exit 15|
|La Mesa||14.74||17A||Lemon Avenue||Northbound exit and southbound entrance|
|El Cajon||19.53||20A||Navajo Road|
|20.39||20B||Grossmont College Drive|
|Santee||Under construction; northbound exit and southbound entrance|
|22.17||22||Northbound exit and southbound entrance|
|22.30||Mission Gorge Road||At-grade intersection|
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