Additional advice.
Use the Esri World imagery after aligning it with the Bing imagery and GPS tracks.
Offset 6.34;0.38 is in my opinion as close as you can get.
Hide all buildings with the filter tool. Now you have a clear view on the highways.
Keep in mind that here are many high rise buildings which need to be mapped on a specific manner. 
See this Youtube video.
https://www.youtube.com/watch?v=_wdosTPbdm4
After mapping highways, you need to adjust the buildings which crosses the highways you mapped.
Best to do that is running the validation tool and select the line where the building crosses the highway is listed.
Use the to-do list to go through the errors and move the buildings away from the highway.
Since it is a highway only project, just focus on these issues.

Best regards
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