Also, bear in mind the Metrorail orange line runs along I-66, so mass transit is available. The DC region's workforce is highly educated and many workers have a decent degree of freedom about their schedule. It sounds like people have also been carpooling more, too. That goes to your point about raising peak throughput -- the easy way to avoid paying the toll is to have someone along for the ride, too, which doubles throughput (at a minimum; have a full car and whoa, Nellie). How many billions would it cost to double throughput for SOVs?
"In August 2018, speeds on I-66 averaged 56.2 miles per hour, compared to 52.7 miles per hour for the same time period in 2017."
https://blog.arlingtontransportationpartners.com/one-year-of...
Also, bear in mind the Metrorail orange line runs along I-66, so mass transit is available. The DC region's workforce is highly educated and many workers have a decent degree of freedom about their schedule. It sounds like people have also been carpooling more, too. That goes to your point about raising peak throughput -- the easy way to avoid paying the toll is to have someone along for the ride, too, which doubles throughput (at a minimum; have a full car and whoa, Nellie). How many billions would it cost to double throughput for SOVs?