Evaluations were made about the feasibility of constructing two tunnels through the Santa Ana Mountain Range which could carry 72,000 cars per day and allow for a commuter rail service between Corona and Irvine.
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The express lanes are a four-lane, 10-mile toll road in the median of the Riverside Freeway (SR-91) between the Orange/Riverside County line and the Costa Mesa Freeway (SR-55).