It is conceivable that speed optimization and mainline metering could produce more favorable benefit–cost ratios if they could be implemented via connected and automated vehicle (CAV) technologies. Mainline metering also showed reasonably good benefits but could be challenging to implement. Speed optimization showed excellent benefits but only during narrow ranges of traffic congestion. Coordinated ramp metering did not show significant additional benefits beyond conventional asservissement linéaire d’entrée autoroutière, also known as ALINEA, metering. The split merge design, and the positioning of managed lanes on the right side of the freeway, are two unrelated designs that showed excellent promise (in terms of benefit–cost ratio). The primary tool of evaluation was sensitivity analysis via microscopic traffic simulation, also known as microsimulation. This report describes the outcomes of a project that examined this possibility. Given the positive impacts, it stands to reason that similar breakthroughs might be possible at freeway merge and diverge locations. Alternative intersections and interchanges brought major benefits to the United States during the 2008–2018 time period.
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