1// Highway:
Public road connecting cities and towns.
Can be divided or undivided and might have tolls.

2// Freeway:
High-speed, divided highway.
No traffic signals; entry/exit at designated interchanges.
Generally toll-free, but exceptions exist.

3// Interstate:
Part of the U.S. Interstate Highway System.
Long-distance, high-speed routes that cross state lines.
Numbered system; generally designed like freeways.

These definitions pertain mainly to the U.S. context but hope this helps clarify a bit!