Reminds me of Luik/Liege in Belgium just across the border form Maastricht. It's far worse there especially when you look at how poor the construction is there and how high the pollution seems to be. You can see that city has suffered immensely economically.
The journey through Maastricht over the highway generally wasn't all that bad, traffic would generally flow remarkably well. I think the primary concerns to put a tunnel in was pollution, noise and congestation.
