Carrier profile · USDOT 44035 · MC-144606 · Updated Jun 13, 2026

Duncan & Son Lines Inc

259 power unitsavg 4.7 yrNational · 20 statesBUCKEYE, AZ88/100
CARRIER ACTIVEMC-144606 ACTIVERATED SATISFACTORYHAZMAT
Verified linksduncantruckingltd.comFMCSA SAFER

Safety

Roadside out-of-service rates versus the national benchmark, inspection and crash trends, decoded violation themes, and ELD / hours-of-service integrity — the full safety picture behind the verdict.

Out-of-service rate· 24-mo cumulative · vs national

Vehicle OOS 13.1%24-mo cumulative
050%nat'l 22.26%
Driver OOS 1.2%24-mo cumulative
030%nat'l 6.67%

Every inspection in the window pooled — 329 vehicle and 418 driver inspections over 24 months.

Vehicle OOS rate· vehicle OOS · vehicle-level inspections · 6-month trailing

14.3% · latest 6-mo window▲ Rising

Share of vehicle-level roadside inspections in each trailing six-month window that resulted in a vehicle out-of-service order. Trending up 5.0 pts across the window. The national vehicle benchmark uses the same metric and is shown on the chart.

Roadside inspection history· 24 charted calendar months · vehicle / driver level · any-OOS overlay

408 inspections in the charted months · busiest month Jul '26 · 35

Vehicle-levelDriver-levelAny OOS

Monthly FMCSA roadside inspections across the 24 charted calendar months. Bars show level-qualified vehicle and driver populations; one inspection can qualify for both. The line shows inspections with any out-of-service result.

Inspection coverage· expected vs observed · the fraud signal

Inspection coverage

How heavily FMCSA inspects this fleet for its size — it tells you how much to trust the safety signals above. Thin coverage on a young authority is a fraud signal nobody else surfaces.

Well-monitored
Under-inspected
Expected
Well-monitored
Heavily inspected
≈0.8 / unit·yr
thin signalabundant signal
Within the expected band for a 259-unit fleet — FMCSA has inspected this carrier often enough that the out-of-service and violation signals above are statistically trustworthy.
Registered power units
259
Inspections · 24 mo
419
Annualized
≈210 / yr
Coverage
≈0.8 inspections / unit · yr

BASIC categories· CSA SMS · Aug 2026

46%
Unsafe Driving
Vektor peer est.
56%
Hours-of-Service
Vektor peer est.
39%
Driver Fitness
Vektor peer est.
Controlled Substances
0violations
clean · per-BASIC
26%
Vehicle Maintenance
Vektor peer est.

Percentile = standing among same-exposure peers (higher = worse). FMCSA publishes percentiles for only some carriers (shown official); elsewhere we show a Vektor peer-percentile estimate, or the absolute SMS measure when there are too few inspections to rank.

Violation themes· decoded · grouped by BASIC

What this carrier actually gets cited for — FMCSA violation codes decoded into plain English, ranked by frequency.

  • 392.2 State/local traffic law violation (speeding, etc.)Unsafe Driving120 · 0 OOS
  • 393.45 Brake tubing / hose defectsVehicle Maintenance40 · 14 OOS
  • 395.24 ELD — record edits / dataHOS Compliance27 · 0 OOS
  • 393.9 Inoperative required lampsVehicle Maintenance24 · 8 OOS
  • 393.75 Tires (defective / underinflated / worn)Vehicle Maintenance22 · 19 OOS
  • 396.3 Inspection / repair / maintenance not performedVehicle Maintenance17 · 2 OOS
  • 393.11 Required lamps/reflectors missingVehicle Maintenance16 · 2 OOS
  • 395.8 Record of duty status (log / ELD) not current or missingHOS Compliance15 · 2 OOS
  • 395.3 Driving beyond hours-of-service limitsHOS Compliance13 · 2 OOS
  • 395.22 ELD — provider/registration/malfunctionHOS Compliance8 · 0 OOS

ELD & hours-of-service

71 hours-of-service / ELD violations on record · most recent May 21, 2026. FMCSA does not publish the ELD device brand; these are the carrier's logging-compliance signals.

42ELD device issues
3No log / no ELD
5False logs
13Drove over hours

Trending worse — 81% of ELD violations are in the last 24 months. Falsified-log violations are a serious integrity flag.

Crash history· 144 total · 15 in 24 mo

144
Total crashes
15
In last 24 mo
6
Fatal
31
Injury
YearCrashesFatalInjuryTow
20264014
20258028
20248048
20239019
20222002
2021130513
2020121012
20198008
20185115
20179029
2016120112
20154004
20142002
20136016
20124014
20115005
20105015
20093023
20082002
20072012
20066116
20052112
20044013
20033023
20023222
20012002
20001011
DateStateFatalitiesInjuriesTow-away
Jul 16, 2026AZ00Yes
May 27, 2026AZ00Yes
Apr 29, 2026AZ00Yes
Jan 31, 2026CA01Yes
Nov 12, 2025AZ00Yes
Oct 9, 2025AZ00Yes
Oct 9, 2025CA01Yes
Oct 1, 2025AR00Yes
Aug 23, 2025AZ01Yes
Apr 9, 2025CA00Yes
Apr 7, 2025AZ00Yes
Feb 7, 2025CA00Yes
Dec 27, 2024CA00Yes
Nov 12, 2024AZ01Yes
Aug 18, 2024CA00Yes
Jul 25, 2024CA01Yes
Jun 18, 2024AZ00Yes
Mar 1, 2024CA01Yes
Feb 20, 2024CA01Yes
Jan 13, 2024AZ00Yes
Dec 28, 2023CA00Yes
Nov 8, 2023AZ00Yes
Jul 31, 2023CA00Yes
Jul 27, 2023CA00Yes
Jun 14, 2023AZ00Yes