 Here's the deal. It sounds like there's some high-standing water, some flooding across all lanes of traffic there near 301, and it sounds like the left lane is currently blocked with a couple of vehicles who ended up crashing because of that. It might have been some hydroplane situation, something like that. With unexpected weather like this, it is very, very important for you to be hyper-alert, pay close attention to the roadway, and if you know any spots that tend to flood, be aware. They might be flooded right now. Interloop of the Beltway.