What does OC mean on an oversize permit?
Overcrossing. A bridge that carries a road over the highway, used as a landmark: MONTE VISTA OC is the Monte Vista overcrossing.
On real permits
| Printed | Means | State |
|---|---|---|
| MONTE VISTA OC | Monte Vista overcrossing, a road bridge over I-80 used as a landmark (Caltrans writes OC for overcrossing) | California |