Suffix or a prefix for highway?

There isn't a standard suffix or prefix specifically for "highway". However, there are some common elements used in naming highways:

Prefixes:

* Interstate: (e.g., Interstate 80, I-80)

* US: (e.g., US Route 1, US-1)

* State: (e.g., State Highway 101, CA-101)

* County: (e.g., County Road 12)

Suffixes:

* Expressway: (e.g., Northway Expressway)

* Turnpike: (e.g., Pennsylvania Turnpike)

* Parkway: (e.g., George Washington Parkway)

These are just some examples, and the specific naming conventions can vary depending on the location and type of highway.