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About the I-605 Corridor “Hot Spots” Interchange Program
The I-605 corridor is part of Southern California’s freeway system, connecting commuters, travelers, and truckers between the densely populated Gateway Cities, San Gabriel Valley, Orange County Cities, and much of the region. The I-605, known as the “San Gabriel River Freeway,” is heavily used for local, regional, interregional, and interstate travel and commerce. The Corridor is home to ethnically diverse and historically rich neighborhoods and supports thriving commercial and industrial centers.

The I-605 is a hotbed of “Hot Spots”
The Los Angeles County Metropolitan Transportation Authority (Metro) completed a Feasibility Study analyzing and identifying several “hot spots” along the SR-91, I-605, and I-405 corridors. These “hot spots” are chronic traffic congestion areas attributed to population/employment growth, increased trucking activity due to economic growth in the goods movement industry, and deficiencies in design, capacity, and operations of an older freeway system.

Metro is currently undertaking environmental and final design approvals of Hot Spot improvement projects along I-605 and SR-91. The projects focus on the long-term needs of the I-605 corridor and short-term SR-91 and I-605 early action freeway improvement needs that can be completed within the next 3-5 years.

Proposed improvements for I-605 “Hot Spots”
Metro and the California Department of Transportation (Caltrans) in collaboration with the Gateway Cities Council of Governments and the San Gabriel Valley Council of Governments, are proposing improvements to this corridor, including:

  • Capacity and operational enhancements
  • Additional general purpose lanes
  • Ramp reconfigurations
  • Arterial intersection enhancements
  • Increased signage
  • Safety features