DUNCAN & SON LINES INC
AUTHORIZEDUSDOT
44035
MC Number
144606
Fleet Size
259
Total Drivers
231
Last updated: March 16, 2026
Broker verification report
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Safety overview
DUNCAN & SON LINES INC is a large interstate motor carrier based in BUCKEYE, Arizona, operating 259 power units with 231 drivers. CarrierOwl is currently validating BASIC percentile display against the official FMCSA SMS portal; use the inspection, out-of-service, crash, authority, and insurance data below as the primary public safety indicators on this page. Their driver out-of-service rate of 1.1% comes in under the 5.51% national average. They have 15 crashes on file (6 with injuries). FMCSA records show 364 inspections for this carrier.
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BASIC scores
Under reviewCarrierOwl is validating BASIC percentile calculations against the official FMCSA SMS portal. Until that review is complete, use FMCSA directly for current BASIC percentiles and use the inspection, out-of-service, crash, authority, and insurance data on this page as supporting indicators.
BASIC percentile display is temporarily paused while we validate CarrierOwl's methodology against the official FMCSA SMS portal.
Out-of-service rates vs. national average
An out-of-service order means the driver or vehicle was pulled from operation during a roadside inspection.
For reference, the average driver OOS rate in Arizona is 12.5% and the average vehicle OOS rate is 26.7% across 29,313 carriers.
Company details
- Entity Type
- N/A
- Carrier Operation
- Interstate
- Operation Classification
- Authorized For Hire
- Cargo Carried
- N
- Hazmat
- Yes
- Safety Rating Date
- N/A
Inspections
364
Total
56%
Driver %
Insurance on file
Liability (BIPD)
NATIONAL INTERSTATE INSURANCE COMPANY — eff. Sep 15, 2021
Cargo
Not on file
Surety Bond
Not on file
Trust Fund
Not on file
Crash history
15
Total Crashes
Similar carriers in Arizona
Other carriers in the same state with a similar fleet size.
CTI INC
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ROADMASTER EQUIPMENT LEASING INC
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PAULEY CONSTRUCTION LLC
Frequently asked questions
Is DUNCAN & SON LINES INC authorized to operate?
Yes. DUNCAN & SON LINES INC (USDOT #44035) currently holds "AUTHORIZED" status with FMCSA. They're registered as an interstate carrier.
What is DUNCAN & SON LINES INC's safety record?
DUNCAN & SON LINES INC has 364 inspections on file and 15 crashes on record. They do not show a formal FMCSA safety rating in CarrierOwl's current data. CarrierOwl is validating BASIC percentile display against the official FMCSA SMS portal, so brokers should verify current BASIC percentiles directly with FMCSA before relying on them.
How many trucks does DUNCAN & SON LINES INC operate?
DUNCAN & SON LINES INC operates 259 power units with 231 drivers on file. That puts them in the large carrier category by FMCSA standards.
Does DUNCAN & SON LINES INC transport hazardous materials?
Yes. DUNCAN & SON LINES INC is flagged for hazardous materials transportation with FMCSA. That means additional safety requirements and more frequent inspections.
Where is DUNCAN & SON LINES INC located?
DUNCAN & SON LINES INC is based in BUCKEYE, Arizona at 23860 W US HWY 85, 85326. Phone: (623) 386-4511.
What are DUNCAN & SON LINES INC's out-of-service rates?
DUNCAN & SON LINES INC's driver out-of-service rate is 1.1%, compared to the national average of 5.51%. Below average, which is a good sign. Their vehicle out-of-service rate is 11.2% (national average: 20.72%). Below average, suggesting the fleet is well-maintained.