This intersection has a special exception to the typical turn restriction rules and it's been locked by a CM to prevent well-meaning editors from undoing things.
If you turn on your Landmarks layer, there's a small landmark right on the junction that explains things. If you disagree, you need to contact the CM directly through the forum PMs to discuss things.
New Orleans, Louisiana, USA
South-Central Regional Coordinator
(LA/MS/AR...contact karlcr9911 for TX/OK related issues)
U.S. Champ, Global ChampWaze FAQ
... Best Map Editing PracticeAsk me about Louisiana Editors Chat in Google Hangouts!