Rock N A Materials Llc is an active intrastate non-hazmat carrier based in San Marcos, TX.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 3 | 0 | 0 |
| Tractors | 0 | 3 | 0 |
| Trailers | 0 | 4 | 0 |
| Total Power Units | 3 | ||
Distinct vehicles · 24 mo
vs 3 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category | Insp w/ Viol |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 92% | 94% | Worse than most peers |
| HOS Compliance | 0% | 0% | Better than most peers |
| Driver Fitness | 0% | 0% | Better than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 93% | 95% | 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 | — | 4.44% |
Where they run
Inspected in 1 state. Top state TX accounts for of activity.
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| No crashes recorded | 0 | 0 | 0 | 0 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 15 | 2 | 2 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Jan 15, 2026 | TX | TRUCK TRACTOR | 0 | 0 |
| May 12, 2025 | TX | STRAIGHT TRUCK | 6 | 2 |
| Sep 3, 2024 | TX | TRUCK TRACTOR | 7 | 0 |
| May 20, 2024 | TX | TRUCK TRACTOR | 1 | 0 |
Carriers that share an officer, phone, or email with this DOT.
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 0 | 0.00 | — |
| HOS Compliance | 0 | 0.00 | — |
| Vehicle Maintenance | 6 | 15.00 | — |
| Driver Fitness | 0 | 0.00 | — |
| Controlled Substances | 0 | 0.00 | — |
| Unsafe Driving |
| 1 |
| 0 |
| 0 |
| May 17, 2024 |
| TX |
| TRUCK TRACTOR |
| 2 |
| 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| May 12, 2025 | 393130 | No/improper heavy vehicle/machine securement | Vehicle Maintenance | Yes |
| May 12, 2025 | 39343D | No or defective automatic trailer brake | Vehicle Maintenance | Yes |
| May 12, 2025 | 39395A | No/discharged/unsecured fire extinguisher | Vehicle Maintenance | — |
| May 12, 2025 | 39395F | Emergency Equipment - Stopped vehicle warning devices missing or improper | Vehicle Maintenance | — |
| May 12, 2025 | 3939T | Inoperable tail lamp | Vehicle Maintenance | — |
| May 12, 2025 | 39617C | Operating a CMV without proof of a periodic inspection | Vehicle Maintenance | — |
| Sep 3, 2024 | 39311 | No or defective lighting devices or reflective material as required | Vehicle Maintenance | — |
| Sep 3, 2024 | 39355C2 | CMV other than truck-tractor manufactured on or after March 1 1998 not equipped with an antilock brake system | Vehicle Maintenance | — |
| Sep 3, 2024 | 39375C | Tire-other tread depth less than 2/32 of inch measured in a major tread groove | Vehicle Maintenance | — |
| Sep 3, 2024 | 39378 | Wipers - Inoperative / missing / damaged wipers | Vehicle Maintenance | — |