< Oklahoma | Major roads
Functional classification
Oklahoma is participating in the new Functional Classification.
- Note: The Oklahoma DOT Maps are the official maps that should be followed for functional classification in the state of Oklahoma. The INCOG maps may not be approved by the FHWA and should only be used to reference in new construction where the DOT maps do not have the road.
Road naming
Interstates = I-XX
US Highway = US-XX
State Highway = SH-XX
County Road = CR-XX (varies by county, see Oklahoma/Counties for further guidance)
Interstates throughout the state
- I-35 Texas to Kansas
- I-40 Texas to Arkansas
- I-44 Texas to Missouri
- I-235 Spur through Oklahoma City
- I-240 Spur between Oklahoma City and Moore
- I-244 Bypass of Tulsa
- I-444 Auxiliary to I-244 in Tulsa
In Oklahoma we have a set minimum standard for locking roads based on segment type. Any road of a certain segment type must be locked at least to the rank (level) in the chart below. Roads may be locked higher for protection and special situations (areas with construction, tricky design, frequent mistakes, imaging inaccuracies, and the like), but should not be locked lower.
A great time to implement these locks is while bringing the road types of an area into compliance with the current US road type standards (FC and highway systems). Lock the roads based on type after they've been set to current US road type standards.
| Segment Type | Default locks |
|---|---|
| Freeway | 5 |
| Ramp | Highest rank of connected segment |
| Major Highway | 3 |
| Minor Highway | 3 |
| Primary Street | 2 |
| Street | 1 |
| • • • • Ferry • • • • | 5 |
| |-|-|-|-|-|-|-|-|-| Railroad |-|-|-|-|-|-|-|-|-| | 2 |