| NHS - Interstate |
| NHS - STRAHNET Connector |
| NHS - Other - One-way pair |
| NHS - Other - Truck route exclusion |
| NHS - Major Airport |
| NHS - Major Port Facility |
| NHS - Major Amtrak Station |
| NHS - Major Rail/Truck terminal |
| NHS - Major Intercity Bus terminal |
| NHS - Major Public Transit or Multi-Model Passenger Terminal |
| NHS - Major Ferry Terminal |
| NHS - Other (not in above categories) |
| NHS - MAP-21 |
| Non-NHS |
