Chicago has this and uses gates to control the flow. The extra lane can help either direction.
⚡️🇨🇳 WATCH - In China, there are access roads where a new lane can be unblocked if traffic is too congested.
https://blossom.primal.net/722e00bb3281d07f8e0579d541665c3f8894dcdcea819c42f75c32322918799a.mp4
Chicago has this and uses gates to control the flow. The extra lane can help either direction.
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