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The SR 210 Lane Addition/Base Line Interchange project, designed to provide increased traffic flow throughout this corridor, will be built as one project. To eliminate the existing bottleneck and provide lane continuity, the SR 210 will be widened from Sterling Avenue to San Bernardino Avenue in the cities of San Bernardino, Highland, and Redlands, as well as an unincorporated portion of San Bernardino County. Base Line Interchange will also be widened from Buckeye Street to Seine Avenue in the City of Highland.

Fact Sheets

Eastbound Traffic Switch Ends & Eastbound SR 210 On-Ramp at San Bernardino Avenue – No Access to Eastbound I-10 Connector

On Monday, August 15, the current EB SR 210 temporary crossover lane will be removed, and the lanes will be shifted to the newly paved roadway on EB SR 210.  As part of this new configuration, crews will implement a temporary lane configuration that will affect traffic movements on EB SR 210. Concrete barriers will be installed from San Bernardino Avenue to the EB/WB I-10 connectors to safely separate travel lanes from adjacent work areas. In this configuration, motorists entering EB SR 210 using the on-ramp at San Bernardino Avenue will not be able to access the EB I-10 connector and will be automatically directed onto WB I-10. This configuration will also be in place for approximately five to six months.

Suggested Detour:From San Bernardino Avenue travel south on Tennessee Avenue and turn left on EB I-10 on-ramp to access freeway

Westbound SR 210 Temporary Crossover Lane

On Monday, August 22, 2022, a temporary crossover lane will go into effect on westbound (WB) SR 210, between San Bernardino Avenue and Base Line. This temporary traffic pattern will shift one lane of traffic on WB SR 210 to the other side of the center median for 2.5 miles, allowing crews to begin pavement rehabilitation activities on the existing WB roadway. This configuration will be in place for approximately six months. Please note that the eastbound (EB) SR 210 temporary crossover lane that was constructed in early-2022 will be complete and traffic will be shifted back to the newly paved EB lanes before the WB crossover lane goes into effect.

  • Drivers entering WB SR 210 from the EB/WB I-10 connectors will be able to access both lanes and have access to local exits via the outside lane (also known as the #2 lane).
  • Drivers in the crossover lane (also known as the #1 lane) will not be able to exit at 5th Street/Greenspot Road or Base Line, the next available exit for motorists in the #1 lane will be the northbound (NB) SR 330 connector.
  • Drivers in the #2 lane will still be able to access both 5th Street/Greenspot Road and Base Line exits.
  • Drivers entering WB SR 210 from San Bernardino Avenue and 5th Street/Greenspot Road will only have access to the #2 lane until the crossover lane merges with traffic at Base Line.

With the project almost 70% complete, the EB lane rehabilitation is finished and crews will start rehabilitating the WB lanes. The upcoming WB crossover lane is a major step toward project completion.


Project Update Webinars

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