Metro General Manager Richard Sarles will be chatting with Dr. Gridlock (aka Robert Thomson), Dana Hedgpeth(aka @postmetrogirl on Twitter) and special guests Tuesday at 1 p.m. in a Google+ Hangout.

The guests include Greater Greater Washington blog founder David Alpert; Michael Perkins, who also blogs at GGW and Infosnack; and Ben Ross of the Action Committee for Transit.

You can submit questions for Sarles and view the Hangout live on the Dr. Gridlock blog. E-mail questions to transportation@washpost.com. On Twitter, tweet them to @drgridlock or @postmetrogirl. Use the #gridchat.

Here is an archived video of the Metro Hangout. Also, Dr. Gridlock will be addressing some of the questions they could not get to in future posts on the blog. Thanks for watching.

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