| Code | Desc |
|---|---|
| AR | Alternate Route |
| CO | Couplet |
| FD | Frontage Road Dec |
| FI | Frontage Road Inc |
| FS | Ferry Ship (Boat) |
| FT | Ferry Terminal |
| PR | Proposed Route |
| RL | Reversible Lane |
| SP | Spur |
| TB | Transitional Turnback |
| TR | Temporary Route |
| CD | Collector Distributor Dec |
| CI | Collector Distributor Inc |
| LX | Crossroad within Interchange |
| P1 - P9 | Off Ramp, Inc |
| Q1 - Q9 | On Ramp, Inc |
| R1 - R9 | Off Ramp, Dec |
| S1 - S9 | On Ramp, Dec |
| HD | Grade-Separated HOV-Dec |
| HI | Grade-Separated HOV-Inc |
| ML | Mainline (implied RRT–field is blank) |
| UC | Under Construction |
| U1 – U9 | Weigh Station Ramp, Inc |
| W1 - W9 | Weigh Station Ramp, Dec |
| X1 - X9 | Rest Area Ramp, Inc |
| Y1 - Y9 | Rest Area Ramp, Dec |
| Ai | e.g., 097AiCN002S2 |
| 51 | e.g., LC2512S5ramp |
| e.g., 520dLCCNQ5 | |
| e.g., 002iCN405Q1 |
| Code | Desc | Note |
|---|---|---|
| AX | Auxiliary | Weaving/Speed Change lanes are a valid special use lane type. They used to be called Auxiliary lanes. |
| BL | Bicycle | |
| CU | Chain-up | |
| CL | Climbing | |
| HV | High occupancy vehicle | |
| HL | Holding | |
| RE | Ramp extension (Not used) | Not Used |
| RV | Reversible (Not used) | Not Used, Reversible lanes are no longer a special use lane (not sure if they ever were), they’re a related route type (RL). |
| SV | Slow vehicle turnouts | |
| TR | Transit | |
| TS | Truck climbing shoulder | |
| TW | Two way turn |