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When I make that commute, I go 32W to 95S to the 495 Beltway.
There's supposed to be some construction on 95 starting this week, though, so I'd take 32W to 295S to the 495 Beltway.
You'll be going against the bulk of the traffic on the major arteries, especially leaving at 4:00. The Beltway is always unpredictable of course, but you should be fine.