1. Looking for a file with Lat-Lon for US Interstate Interchanges.
2. Looking for a file with traffic counts passing each Interstate Interchange.
Any sources you folks are aware of?
You will probably have to go to each states DOT for that data.
I know in my state even though Interstates are Federal roads our DOT manages the traffic flow. However, I don't think they do a constant collection of traffic flow.