The infrastructure, which extends from Costa Mesa to the Los Angeles County line, has been upgraded over 25 km with an additional lane in each direction, as well as the addition of express toll lanes from State Route 73 to Interstate 605. As part of the project, 18 bridges were demolished and reconstructed, many of them incorporating new sidewalks and bike lanes. Ramps and hundreds of retaining walls and sound barrier walls were also added.

The project involved the recycling of 710,000 tonnes of concrete, which were reused for the base course of the new lanes, contributing to a significant reduction in environmental impact. In addition to reduced emissions, it is estimated that travel times will be halved for nearly 400,000 daily drivers, substantially improving the efficiency and capacity of this key regional mobility corridor.