State Route 125 (SR 125) is a state highway in the U.S. state of California that serves as a north–south freeway in the San Diego area. It runs from SR 11 and SR 905 in Otay Mesa, near the Mexican border, to SR 52 in Santee. SR 125 also connects SR 54, SR 94, and I-8. The first parts of SR 125 were added to the state highway system in 1933, connecting Route 94 with US 80. In the 1964 state highway renumbering, what was signed as Route 67 was transferred to the new SR 125. After several delays in funding and in planning, the highway was extended north to SR 52 and south to SR 54 in the early 2000s. The southern portion of SR 125 from SR 11 and SR 905 to SR 54 near Chula Vista is a toll road called the South Bay Expressway. This portion was completed in 2007 after many years of planning and litigation related to concerns over the destruction of endangered species habitat. The toll road was operated by a public-private partnership known as South Bay Expressway LLC. However, the partnership declared bankruptcy in 2010 and sold the road to the San Diego Association of Governments (SANDAG) in 2011. Since then, following a decrease in the toll amount, traffic using the highway has increased. The definition of the SR 125 route continues to SR 56, but this portion has not been constructed, and there are no plans to do so. Route description SR 125 begins as the South Bay Expressway toll road at an interchange with SR 11 and SR 905. The route heads north through an undeveloped area, encountering its first toll plaza just before entering the city of Chula Vista. The freeway cuts through the Eastlake neighborhood of Chula Vista before leaving the city and turning to the northeast, passing through Sweetwater Summit Regional Park near Sweetwater Reservoir. SR 125 intersects with SR 54, where the tolled portion ends. SR 54 runs concurrently with SR 125 north to the Jamacha Road exit. SR 125 continues north again through the unincorporated area of La Presa. The freeway briefly enters Lemon Grove before intersecting with SR 94 and crossing into the city of La Mesa. Passing to the west of Mount Helix, SR 125 interchanges with I-8 before continuing north through the city of El Cajon near Grossmont College. The freeway continues