I live and work in DC. I go to Dallas at least once a year and drive every day during the week and weekend. I agree this would be impossible in Dallas traffic. It doesn't feel as intentionally aggressive as DC traffic, instead it's like everyone in Dallas can't take their foot off the accelerator even if they wanted to. It's hard enough finding a space between two cars to merge, you usually have to just go for it and hope the rear car can find his brakes.