Yes. That is the Capital Beltway. However, Beltway is also used to describe what I already described. It's like when we talk about the M4 corridor in Britain. We're not talking about the road, but the area surrounding it and the companies that are built close to it for easy road access. Gibbs could totally be saying 'this firm is near the I-495, but it's more likely he's using it in the context I said.