The site is just listing the status of the few routers it is monitoring. It's not indicative of all traffic. Do you really think all traffic in/out of MD goes

The site is just listing the status of the few routers it is monitoring. It's not indicative of all traffic. Do you really think all traffic in/out of MD goes through a single (2 if you count DC) router? Put it another way, imagine you're monitoring traffic for SF by monitoring average speeds on the Northbound 280. One pile-up that blocks the road completely brings the average speed at that point to 0mph. Doesn't mean that every road in SF is blocked. Traffic will bail off the 280 and use other routes to get to their destinations (albeit slower and causing average speeds on the surround[ing] road network to drop too), but the one thing you are measuring (average speed on the Northbound 280) has dropped to 0.