So, this happened, and it is fairly commonplace now to get stuck behind these terrible wrecks. Fortunately, no one was hurt, so let me dispense with that up front. It could have been much worse.
The fallout from this is that there was a demonstrable lack of options for drivers today. I saw people driving like maniacs and I saw roads choked with confused drivers. Add to that the rain (in Maryland, when it rains, you automatically assume that the IQ of everyone around you has dropped 30 points and their speed has dropped 30 mph).
If you are dependent on a major artery, there are few, if any, secondary options. Instead of building choke points, maybe would should have focused on ensuring that the road system can handle interruptions. Or would that be too expensive? Nobody has any money anymore and the roads are choked with people trying to get to jobs where they are underpaid. This is not a recipe for improvement.