Chat with Dr. Gridlock on Monday at noon

Questions about your commute? Complaints about Metro? Bring any and all transportation questions, stories and thoughts to Dr. Gridlock. Robert Thomson, the Post’s transportation columnist will be chatting with readers on Monday at noon. Head here to submit questions in advance and head back to participate in the live discussion.

Mark Berman is a reporter on the National staff. He runs Post Nation, a destination for breaking news and developing stories from around the country.

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