Michael Cassidy

Research Expertise and Interest

traffic and transportation operations, traffic control

In the News

Kicking hybrids out of carpool lanes slows all traffic

The end of a California program granting free access to carpool lanes by solo drivers of hybrid cars has unintentionally slowed traffic in all lanes, according to a new report by researchers at UC Berkeley’s Institute of Transportation Studies. It turns out that when regular-use lanes became more congested with the addition of more hybrids, the carpool lanes slowed down as well. The transportation engineers explain this counterintuitive result.

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