http://www.okladot.state.ok.us/traffic/intersections/
Not what I expected, but interesting nonetheless.
Although the PDF itself doesn't show it, this URL here was mildly amusing:
http://www.okladot.state.ok.us/traffic/intersections/0500008%20I-40%20&%20US-66.pdf
The OK SR I-40B shield, also amusing. Those are similar to NJ's Straight Line Diagrams, which offer interchange line diagrams drawn on an aerial background.