| Freeways & Expressways | 55/70 MPH | 1500' ± or per MUTCD |
| Rural Highways | 60/65 MPH | 800' ± |
| Rural Roads | 45/55 MPH | 500' ± |
| Rural Roads & Urban Arterials | 35/40 MPH | 350' ± |
| Rural Roads, Urban Arterials, Residential, Business Districts | 25/30 MPH | 200' ± (2) |
| Urban Streets | 25 MPH or less | 100' ± (2) |
| (1)All spacing may be adjusted to accommodate interchange ramps, at-grade intersections, and driveways. | |
| (2)This spacing may be reduced in urban areas to fit roadway conditions. |