Escort requirements, travel restrictions, and signage rules for oversize/overweight loads in Montana.
| Min Width | Max Width | Escorts | Position | Notes |
|---|---|---|---|---|
| 8'7" | 16'6" | 0 | — | Permit required, no escort |
| 16'7" | 18'0" | 1 | Rear | 1 rear on interstate |
| 18'1" | 20'0" | 2 | Rear | 2 rear (side by side) on interstate |
| Min Height | Max Height | Escorts | Position | Notes |
|---|---|---|---|---|
| 14'1" | 17'0" | 0 | — | Permit required, no escort |
| 17'1" | 24'0" | 1 | Front |
1 front pilot vehicle with height pole required
Height pole required |
| 24'1" | 30'0" | 2 | Front + Rear |
1 front with height pole + 1 rear pilot vehicle
Height pole required |
| Min Length | Max Length | Escorts | Position | Notes |
|---|---|---|---|---|
| 75'1" | 120'0" | 0 | — | Permit required |
| 120'1" | 200'0" | 1 | Rear |
| Min Weight | Max Weight | Escorts | Position | Notes |
|---|---|---|---|---|
| 54,301 lbs | 999,999 lbs | 2 | Front + Rear | DW21 tridem over 54,300 lbs = 2 escorts |
| Min Width | Max Width | Escorts | Position | Notes |
|---|---|---|---|---|
| 8'7" | 12'6" | 0 | — | Permit required |
| 12'7" | 16'6" | 1 | Front | 1 front on 2-lane and non-interstate roads |
| 16'7" | 20'0" | 2 | Front + Rear |
| Min Height | Max Height | Escorts | Position | Notes |
|---|---|---|---|---|
| 14'1" | 30'0" | 0 | — | Height escorts are required on interstate only in Montana; no mandatory height escort on non-interstate |
| Min Length | Max Length | Escorts | Position | Notes |
|---|---|---|---|---|
| 75'1" | 120'0" | 0 | — | Permit required |
| 120'1" | 200'0" | 1 | Rear | |
| 200'1" | 999'0" | 2 | Front + Rear | Superload length — 1 front + 1 rear required |
| Min Weight | Max Weight | Escorts | Position | Notes |
|---|---|---|---|---|
| 54,301 lbs | 999,999 lbs | 2 | Front + Rear | DW21 tridem over 54,300 lbs = 2 escorts |