William N Mason Inc is an active interstate carrier based in Baltimore, MD.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 3 | 0 | 0 |
| Tractors | 12 | 0 | 0 |
| Trailers | 77 | 0 | 0 |
| Total Power Units | 15 | ||
Distinct vehicles · 24 mo
vs 15 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 81% | 90% | Worse than most peers |
| HOS Compliance | 88% | 95% | Worse than most peers |
| Driver Fitness | 0% | 0% | Better than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 88% | 89% | Worse than most peers |
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 | 0 | — | 6.67% |
| Vehicle | 0 | 2 | — | 22.26% |
| Hazmat | 0 | 0 | — |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Oct 1, 2025 | 0 | 0 | 1 | 1 |
| Oct 1, 2024 | 0 | 0 | 1 | 1 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 19 | 6 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Jan 15, 2026 | MD | STRAIGHT TRUCK | 1 | 0 |
| Nov 12, 2025 | MD | TRUCK TRACTOR | 6 | 1 |
| Sep 10, 2025 | VA | TRUCK TRACTOR | 0 | 0 |
| Aug 27, 2025 | MD | TRUCK TRACTOR | 0 | 0 |
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| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 2 | 1.86 | — |
| HOS Compliance | 1 | 0.03 | — |
| Vehicle Maintenance | 9 | 7.30 | — |
| Driver Fitness | 0 | 0.00 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 4 states. Top state MD accounts for 70% of activity. Activity outside home state (MD): 30%.
| 3 |
| Unsafe Driving | 2 | 2 | 0 |
| Hours-of-Service Compliance | 1 | 0 | 0 |
| Aug 22, 2025 |
| MD |
| TRUCK TRACTOR |
| 0 |
| 0 |
| Jun 24, 2025 | MD | TRUCK TRACTOR | 0 | 0 |
| Jun 11, 2025 | MD | TRUCK TRACTOR | 0 | 0 |
| May 9, 2025 | VA | TRUCK TRACTOR | 2 | 0 |
| Mar 20, 2025 | MD | STRAIGHT TRUCK | 1 | 0 |
| Mar 18, 2025 | MD | STRAIGHT TRUCK | 5 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Jan 15, 2026 | 39216D | Driver - Failed to use seat belt while operating a CMV | Unsafe Driving | — |
| Nov 12, 2025 | 393207ASTCB | Suspension - Suspension connecting rod or tracking component assembly (including spring leaves used as a suspension connecting rod) or any part used for attaching | Vehicle Maintenance | Yes |
| Nov 12, 2025 | 39345B2BAIR | Air Brake - Hose/tubing damaged or not secured | Vehicle Maintenance | — |
| Nov 12, 2025 | 39345DB | Air Brake - Audible air leak at a proper connection | Vehicle Maintenance | — |
| Nov 12, 2025 | 39347E | Brake Out of Adjustment - Roto Clamp (Short & Long) DD-3 or Bolt | Vehicle Maintenance | — |
| Nov 12, 2025 | 39353BB | Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear | Vehicle Maintenance | — |
| Nov 12, 2025 | 3965BL | Lubrication - Oil or grease leak | Vehicle Maintenance | — |
| May 9, 2025 | 39378AWS | Washers - Inoperative washing system. | Vehicle Maintenance | — |
| May 9, 2025 | 3965BL | Lubrication - Oil or grease leak | Vehicle Maintenance | — |
| Mar 20, 2025 | 3939ALFTSI | Lighting - Front - Turn signal - inoperative | Vehicle Maintenance | — |