Here are the driving recommendations from the track web site. Compare them with directions you have. Can you call the rally phone # for clarification on the construction? Or do you know someone else who will be there already that you can contact? I haven't heard of anything major in that area. Road repairs happen all over the country. You sometimes have to just go with the flow - even if it's slow. You'll get there. Plan to get around Phoenix between 9am and 2pm. for a little less traffic, as is the case in most big cities. As far as Phoenix goes, we find it a lot easier to get through than some others in the country.
https://www.phoenixraceway.com/Visiting-Phoenix-Raceway/Directions-To-Phoenix-Raceway.aspx