text: If you bring up the "Background" pane in the editor (hit the "B" key or click on the icon that looks a little like three stacked sheets of paper), you can switch through different imagery options.  In this case, there's a clear progression from "empty field" in Esri World Imagery (Clarity) through "roads under construction" in Mapbox Satellite, to "completed roads" in Bing, with the beginnings of additional construction in the National Agricultural Imagery Program aerials.
  
  I'd trace using Bing, because it appears to be the best combination of "recent", "sharp", and "well-aligned".