Duncan & Son Lines Inc is an active interstate carrier based in Buckeye, AZ.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 259 | 0 | 0 |
| Tractors | 0 | 259 | 0 |
| Trailers | 0 | 0 | 3,000 |
| Total Power Units | 259 | ||
Distinct vehicles · 24 mo
vs 259 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 100% | 92% | Worse than most peers |
| HOS Compliance | 94% | 93% | Worse than most peers |
| Driver Fitness | 33% | 94% | Around peer average |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 39% | 81% | Around peer average |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 7 | — | 6.67% |
| Vehicle | 0 | 33 | — | 22.26% |
| Hazmat | 21 | 0 | 0.00% |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Jan 1, 2026 | 0 | 1 | 1 | 1 |
| Oct 1, 2025 | 0 | 1 | 4 | 4 |
| Jul 1, 2025 | 0 | 1 | 1 | 1 |
| Apr 1, 2025 | 0 | 0 | 2 | 2 |
| Jan 1, 2025 | 0 | 0 | 1 | 1 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 108 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Mar 25, 2026 | CA | TRUCK TRACTOR | 0 | 0 |
| Mar 23, 2026 | CA | TRUCK TRACTOR | 0 | 0 |
| Mar 23, 2026 | CA | TRUCK TRACTOR | 0 | 0 |
| Mar 23, 2026 | CA | TRUCK TRACTOR | 0 | 0 |
| Mar 18, 2026 | CA |
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 41 | 1.55 | — |
| HOS Compliance | 24 | 0.37 | — |
| Vehicle Maintenance | 86 | 2.09 | — |
| Driver Fitness | 2 | 0.07 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 18 states. Top state CA accounts for 61% of activity. Activity outside home state (AZ): 83%.
+13 other states with fewer inspections
| Oct 1, 2024 |
| 0 |
| 1 |
| 2 |
| 2 |
| Jul 1, 2024 | 0 | 0 | 1 | 1 |
| 36 |
| Unsafe Driving | 44 | 15 | 0 |
| Hours-of-Service Compliance | 35 | 14 | 3 |
| Driver Fitness | 4 | 2 | 4 |
| TRUCK TRACTOR |
| 0 |
| 0 |
| Mar 18, 2026 | CA | TRUCK TRACTOR | 1 | 1 |
| Mar 18, 2026 | TX | TRUCK TRACTOR | 0 | 0 |
| Mar 13, 2026 | CA | TRUCK TRACTOR | 1 | 0 |
| Mar 11, 2026 | CA | TRUCK TRACTOR | 0 | 0 |
| Mar 10, 2026 | AZ | TRUCK TRACTOR | 2 | 1 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Mar 18, 2026 | 39345ABHTBS | Air Brake - Hose/tubing with a bulge/swelling when air pressure is applied | Vehicle Maintenance | Yes |
| Mar 13, 2026 | 3922SLLS2 | State/Local Laws - Speeding 6-10 miles per hour over the speed limit | Unsafe Driving | — |
| Mar 10, 2026 | 39375A3TAOL | Tires - All others leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS | Vehicle Maintenance | Yes |
| Mar 10, 2026 | 39395A4EEUS | Emergency Equipment - Fire Extinguishers - unsecured | Vehicle Maintenance | — |
| Mar 10, 2026 | 3939ALSLIWR | Lighting - Stop lamps - Both inoperative when required to be on | Vehicle Maintenance | Yes |
| Mar 10, 2026 | 3939ALTSI | Lighting - Turn signal - Any inoperative on the rearmost vehicle. | Vehicle Maintenance | Yes |
| Mar 3, 2026 | 39311A1CSLRR | Conspicuity Systems - Truck tractor lower rear retro reflective sheeting missing on vehicle manufactured on or after July 1 1997 | Vehicle Maintenance | — |
| Mar 3, 2026 | 3939ALBL | Lighting - Backup lamp inoperative | Vehicle Maintenance | — |
| Feb 26, 2026 | 3922SLLLR | State/Local Laws - Lane restriction violation | Unsafe Driving | — |
| Feb 26, 2026 | 39393BSBA | Seatbelts - Trucks and truck-tractors not equipped/defective | Vehicle Maintenance | — |