This maps all the TMCs from the NPMRDS, as well as offers a TMC lookup feature. Zoom pretty far in for the segment coverage to appear (tip: hold down Shift while drawing a small box around your area of interest).
If you know a specific TMC code, click the small “TMC” button in the upper right to enter it, and the map will zoom to the segment and highlight it blue. You can also click on any segment shown to find its TMC code.
The NPMRDS version shown is currently 2015 Q4.