| Code Value | Definition |
|---|---|
| 1 | Wearing corrective lenses |
| 2 | Wearing hearing aid |
| 3 | Accompanied by a waiver/exemption |
| 4 | Driving within an exempt intra city zone |
| 5 | Accompanied by a Skill Performance Evaluation certificate (SPE) |
| 6 | Qualified by operation of 49 CFR 391.64 |