Carrier profile · USDOT 348981 · Updated Jun 13, 2026

W B Mason Co Inc

834 power unitsavg 3.3 yrNational · 21 statesBROCKTON, MA88/100
AUTHORITY STATUS UNKNOWNRATED CONDITIONALHAZMAT

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 11.2%24-mo cumulative
050%nat'l 22.26%
Driver OOS 2.2%24-mo cumulative
030%nat'l 6.67%

Every inspection in the window pooled — 286 vehicle and 502 driver inspections over 24 months.

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

18.0% · 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 2.3 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

495 inspections in the charted months · busiest month Jan '26 · 28

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.

Thin coverage
Under-inspected
Expected
Well-monitored
Heavily inspected
0.3 / unit·yr
thin signalabundant signal
Few roadside inspections for a 834-unit fleet — the out-of-service and violation signals above rest on a small sample, so weight them cautiously. Thin coverage on a young authority is itself a flag.
Registered power units
834
Inspections · 24 mo
502
Annualized
251 / yr
Coverage
0.3 inspections / unit · yr

BASIC categories· CSA SMS · Aug 2026

23%
Unsafe Driving
Vektor peer est.
5%
Hours-of-Service
Vektor peer est.
73%
Driver Fitness
Vektor peer est.
Controlled Substances
0violations
clean · per-BASIC
28%
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 Driving135 · 0 OOS
  • 393.9 Inoperative required lampsVehicle Maintenance71 · 4 OOS
  • 396.3 Inspection / repair / maintenance not performedVehicle Maintenance25 · 22 OOS
  • 390.21 USDOT number marking on vehicleUnsafe Driving24 · 0 OOS
  • 393.47 Brake actuators / linings / componentsVehicle Maintenance22 · 3 OOS
  • 392.16 Failure to use seat beltUnsafe Driving22 · 0 OOS
  • 393.95 Emergency equipment (extinguisher, triangles)Vehicle Maintenance16 · 0 OOS
  • 396.17 Periodic (annual) inspectionVehicle Maintenance13 · 0 OOS
  • 393.75 Tires (defective / underinflated / worn)Vehicle Maintenance13 · 10 OOS
  • 393.53 Automatic brake adjusters / indicatorsVehicle Maintenance13 · 0 OOS

ELD & hours-of-service

9 hours-of-service / ELD violations on record · most recent Jan 7, 2026. FMCSA does not publish the ELD device brand; these are the carrier's logging-compliance signals.

5ELD device issues
4No log / no ELD
0False logs
0Drove over hours

Trending worse — 60% of ELD violations are in the last 24 months.

Crash history· 171 total · 14 in 24 mo

171
Total crashes
14
In last 24 mo
7
Fatal
80
Injury
YearCrashesFatalInjuryTow
20261011
20259168
2024160515
20239058
2022152614
2021120611
2020170516
2019110311
2018150415
2017130711
20162012
20154113
20146035
2013101610
20126134
20116155
20104023
20097055
20081011
20061010
20052012
20043023
20031011
DateStateFatalitiesInjuriesTow-away
Mar 5, 2026PA01Yes
Oct 8, 2025NH00Yes
Sep 9, 2025NY02No
Feb 28, 2025NJ01Yes
Feb 27, 2025NY11Yes
Feb 20, 2025PA01Yes
Feb 19, 2025FL00Yes
Feb 6, 2025CT01Yes
Feb 4, 2025NY01Yes
Jan 17, 2025CT00Yes
Dec 9, 2024MA01Yes
Dec 4, 2024CT00Yes
Oct 16, 2024PA00Yes
Sep 10, 2024MA00Yes
Aug 1, 2024NJ00Yes
Jul 31, 2024NJ00Yes
Jul 12, 2024NJ03No
Jul 10, 2024FL01Yes
May 30, 2024MA02Yes
May 27, 2024MA00Yes
May 21, 2024NH01Yes
May 16, 2024MD00Yes
Apr 4, 2024VT00Yes
Mar 22, 2024CT00Yes
Mar 14, 2024MD00Yes