Safety Measurement System - Complete SMS Profile (U.S. DOT# 260536)

MICHAEL T KNOWLES KENNIE C KNOWLES AND WILMA E KNOWLES

DBA: DON D DAVIS TOWING KENNIE C KNOWLES TRUCKING

U.S. DOT#: 260536

Address: 3411 S MARKET ST
REDDING, CA 96001
Number of Vehicles: 5
Number of Drivers: 3
Number of Inspections: 21

Safety Rating & OOS Rates AND Licensing and Insurance

As part of FMCSA’s IT modernization strategy, we are in the process of merging our data platforms to make it easier for you to find the information you need. During this transition, please refer to the links below for additional information about this carrier.

For licensing and insurance information, visit Motus: USDOT Registration System.
For safety rating and Out-of-Service (OOS) rates, visit SAFER.
If you are a motor carrier looking for your Inspection Selection System (ISS) value, log in to the FMCSA Portal.

BASIC Status (Public Property Carrier View)

Behavior Analysis & Safety Improvement Categories (BASICs) Based on a 24-month record ending June 26, 2026

On-Road Performance
0 Measure	Not Public	0 Measure	4.31 Measure	0 Measure	Not Public	0 Measure
On-Road Performance Detail
Driver Inspections with Unsafe Driving Violations: 0 Safety Event Group: No Safety Event Grouping Avg. PU × UF: 9.3 Segment: Straight Carrier	Not Public	Driver Inspections: 18 with HOS Compliance Violations: 0 Safety Event Group: 11-20 relevant driver inspections	Vehicle Inspections: 21 with Vehicle Maint. Violations: 9 Safety Event Group: 21-100 relevant vehicle inspections	Driver Inspections: 18 with Drugs/Alcohol Violations: 0 Safety Event Group: No Safety Event Grouping	Not Public	Driver Inspections: 18 with Driver Fitness Violations: 0 Safety Event Group: 11-20 relevant driver inspections
Investigation Results
No Acute/Critical Violations Discovered	N/A	No Acute/Critical Violations Discovered	No Acute/Critical Violations Discovered	No Acute/Critical Violations Discovered	Not Public	No Acute/Critical Violations Discovered

Select a BASIC icon above to get details, or view your Complete SMS Profile.

Violation Summary

Violations: 20


Violations	Description	# Violations	# OOS Violations	Violation Severity Weight	BASIC

393.201A-FRCLS	Frame - Cracked/loose/sagging/broken frame or chassis	1	0	2	Vehicle Maint.
393.207A-SUBL	Suspension - U-bolt, u-bolt bottom plate, or other axle clamp bolt loose/cracked/broken/missing.	1	1	7	Vehicle Maint.
393.45B2-B-AIR	Air Brake - Hose/tubing damaged or not secured	2	0	4	Vehicle Maint.
393.45B2-BHTD	Air Brake - Hose/tubing damage into the outer reinforcement ply.	2	2	4	Vehicle Maint.
393.45(d)	Brake connections with leaks or constrictions	1	0	4	Vehicle Maint.
393.45D-B	Air Brake - Audible air leak at a proper connection	1	0	4	Vehicle Maint.
393.45D-BAAL	Air Brake - Audible air leak at other than a proper connection	1	1	4	Vehicle Maint.
393.47(e)	Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt	2	0	4	Vehicle Maint.
393.50D-B	Air Brake - Missing or defective drain valve	1	0	4	Vehicle Maint.
393.70B1I-CDFWFMI-MT20	Coupling - More than 20% of the fifth wheel fasteners on either side missing/ineffective	1	1	3	Vehicle Maint.
393.75A3-ATIS	Tires - All others, leaking in tread area with inflation more than 50% of the maximum inflation pressure on tire equipped with ATIS	1	1	8	Vehicle Maint.
393.9	Inoperable Required Lamp	1	0	2	Vehicle Maint.
393.9A-LFTSI	Lighting - Front - Turn signal - inoperative	2	0	6	Vehicle Maint.
393.9A-LSLIWR	Lighting - Stop lamps - Both inoperative when required to be on	1	1	6	Vehicle Maint.
396.3(a)1BOS	Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination	1	1	0	Vehicle Maint.
396.5-HL	Hubs - Leaking hub	1	1	2	Vehicle Maint.

Inspection History

Total Inspections: 21


Report			Vehicle			Measure
Inspection Date	Number	State	Plate Number	Plate State	Type	Severity Weight (SW)	Time Weight (TiW)

4/10/2026	CANC3J999673	CA	65520F4	CA	STRAIGHT TRUCK		3
12/9/2025	CANC3J001746	CA	1VZ8037	CA	SEMI-TRAILER		2
11/26/2025	CANC3J001739	CA	9G66963	CA	STRAIGHT TRUCK		2
10/8/2025	CAUG0K005449	CA	8C94661	CA	STRAIGHT TRUCK		2
10/8/2025	CAUG0K005450	CA	7G53467	CA	STRAIGHT TRUCK		2
8/29/2025	CAUDYB000672	CA	70828M3	CA	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.45B2-BHTD Air Brake - Hose/tubing damage into the outer reinforcement ply. (OOS)						4 + 2 (OOS)
Vehicle Maint. Violation: 393.45D-B Air Brake - Audible air leak at a proper connection						4
Vehicle Maint. Violation: 396.5-HL Hubs - Leaking hub (OOS)						2 + 2 (OOS)
Vehicle Maint. Violation: 393.45B2-B-AIR Air Brake - Hose/tubing damaged or not secured						4
Vehicle Maint. Violation: 393.201A-FRCLS Frame - Cracked/loose/sagging/broken frame or chassis						2
Vehicle Maint. Violation: 393.9A-LSLIWR Lighting - Stop lamps - Both inoperative when required to be on (OOS)						6 + 2 (OOS)
7/9/2025	CAUG0K005223	CA	9G66963	CA	STRAIGHT TRUCK		2
7/7/2025	CAUF9S001150	CA	9G66963	CA	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.70B1I-CDFWFMI-MT20 Coupling - More than 20% of the fifth wheel fasteners on either side missing/ineffective (OOS)						3 + 2 (OOS)
7/7/2025	CAUDYB000609	CA	65520F4	CA	STRAIGHT TRUCK		2
7/1/2025	CAUF9S001132	CA	70828M3	CA	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.45D-BAAL Air Brake - Audible air leak at other than a proper connection (OOS)						4 + 2 (OOS)
6/13/2025	CAUG23000159	CA	9G66963	CA	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.45B2-B-AIR Air Brake - Hose/tubing damaged or not secured						4
4/24/2025	CAUEFK003649	CA	WP41689	CA	TRUCK TRACTOR		1
Vehicle Maint. Violation: 393.50D-B Air Brake - Missing or defective drain valve						4
Vehicle Maint. Violation: 393.9A-LFTSI Lighting - Front - Turn signal - inoperative						6
4/22/2025	CAUEFK003638	CA	9G66963	CA	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.75A3-ATIS Tires - All others, leaking in tread area with inflation more than 50% of the maximum inflation pressure on tire equipped with ATIS (OOS)						8 + 2 (OOS)
Vehicle Maint. Violation: 393.207A-SUBL Suspension - U-bolt, u-bolt bottom plate, or other axle clamp bolt loose/cracked/broken/missing. (OOS)						7 + 2 (OOS)
Vehicle Maint. Violation: 393.9A-LFTSI Lighting - Front - Turn signal - inoperative						6
Vehicle Maint. Violation: 396.3(a)1BOS Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination (OOS)						0 + 2 (OOS)
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
10/7/2024	CANDMK005711	CA	9F97567	CA	TRUCK TRACTOR		1
Vehicle Maint. Violation: 393.45B2-BHTD Air Brake - Hose/tubing damage into the outer reinforcement ply. (OOS)						4 + 2 (OOS)
9/19/2024	CAUF9S000645	CA	8C94661	CA	STRAIGHT TRUCK		1
9/19/2024	CAUF9S000646	CA	7G53467	CA	STRAIGHT TRUCK		1
9/19/2024	CAUF9S000647	CA	5N97579	CA	STRAIGHT TRUCK		1
9/12/2024	CANDZX002837	CA	9G66963	CA	STRAIGHT TRUCK		1
8/30/2024	CAUG0K004595	CA	9G66963	CA	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.45(d) Brake connections with leaks or constrictions						4
8/29/2024	CAUDMP000433	CA	70828M3	CA	STRAIGHT TRUCK		1
8/28/2024	CAUDMP000429	CA	70828M3	CA	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.9 Inoperable Required Lamp						2
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4

Reviewed-Not Preventable Crash Activity (vehicles involved in crashes)

Total Number of Crashes: 0

This carrier has no crashes to display.

Crashes Included in SMS (vehicles involved in crashes)

Total Number of Crashes: 0

This carrier has no crashes to display.

Investigation Results

Acute/Critical Violations: 0

This carrier has no Acute/Critical violations to display.

Summary of Activities

The summary includes information on the 5 most recent investigations and 24 months of inspections and crash history.

Most Recent Investigation: 11/4/2010 (Compliance Review)
Total Inspections: 21
- Total Inspections without Violations used in SMS: 12
- Total Inspections with Violations used in SMS: 9
Total Crashes* : 0

*Crashes listed represent a motor carrier’s involvement in reportable crashes, regardless of the carrier’s or driver’s role in the crash. Continue for details.

Continue for more Crash, Inspection & Investigation Details

Carrier Registration

Carrier Registration Details Subject to General Threshold Update Registration Info

Inspection Selection System

For licensing and insurance information, visit Motus: USDOT Registration System.
For safety rating and Out-of-Service (OOS) rates, visit SAFER.
If you are a motor carrier looking for your Inspection Selection System (ISS) value, log in to the FMCSA Portal.

Enforcement Cases

(Six years as of 08/04/2026 updated monthly from FMCSA )

No penalties found

Tools/Resources

SMS Methodology How to Improve Request a Data Review

For U.S. DOT# 260536

Complete SMS Profile Carrier History Downloads

Summary of Activities (as of 6/26/2026, updated monthly)

The summary includes information on the 5 most recent investigations and 24 months of inspections and crash history.

Most Recent Investigation: 11/4/2010 (Compliance Review)	Total Inspections: 21 Total inspections without violations used in SMS: 12 Total inspections with violations used in SMS: 9	Total Crashes: 0*
11/4/2010 (Compliance Review) 8/7/1999 (Compliance Review) 6/3/1998 (Compliance Review) 5/16/1997 (Compliance Review) 8/20/1996 (Compliance Review)	# Insp. OOS Driver Inspections 18 0.0% Vehicle Inspections 21 23.8% Placardable HM Inspections 0 0.0% % Placardable HM Inspections 0.0%	Fatal Crashes 0 Injury Crashes 0 Towaway Crashes 0

*Crashes listed represent a motor carrier’s involvement in reportable crashes, regardless of the carrier’s or driver’s role in the crash. Continue for details.

Downloads

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Average PU × Utilization Factor (as of 6/26/2026, updated monthly)

The SMS normalizes the Unsafe Driving and Crash Indicator BASICs measure by carrier size (i.e., a hybrid power unit and vehicle miles travelled measure) to account for exposure. Carrier size is defined as average power units multiplied by the utilization factor.

9.3 Average PU × Utilization Factor = 6 Average Power Units × 1.5417 Utilization Factor

Average Power Units
Utilization Factor

In order to account for changes in a carrier's fleet size during the previous 24 months an average power unit value is used in the calculation to determine a carrier's Unsafe Driving BASIC and Crash Indicator measures.

6 Average Power Units = 5 Current Power Units + 5 Power Units 6 Months Ago + 8 Power Units 18 Months Ago
3

The Utilization Factor is a multiplier that adjusted the average PU values based on the utilization in terms of VMT per average PU.

Determine Carrier Segment: Straight
Straight trucks/other vehicles constituting more than 30% of the total PU
U.S. DOT# 260536 = 40% Straight trucks/other vehicles
Determine VMT per Average Power Unit
30,833 VMT per Average Power Unit = 185,000 VMT From Registration (MCS-150) ÷ 6 Average Power Units

Based on Step 1 and 2 calculate the Utilization Factor

Straight Segment
Meets Criteria	VMT per Avgerage PU	Utilization Factor
	< 20,000	1
	20,000 – 60,000	1.5417 = 30,833 VMT per PU ÷ 20,000
	60,000 – 200,000	3
	> 200,000	1
	No Recent VMT Information	1

Use of SMS Data/Information

FAST Act of 2015:

Readers should not draw conclusions about a carrier's overall safety condition simply based on the data displayed in this system. Unless a motor carrier has received an UNSATISFACTORY safety rating under part 385 of title 49, Code of Federal Regulations, or has otherwise been ordered to discontinue operations by the Federal Motor Carrier Safety Administration, it is authorized to operate on the Nation's roadways.

Safety Measurement System:

The data in the Safety Measurement System (SMS) is performance data used by the Agency and Enforcement Community. A symbol, based on that data, indicates that FMCSA may prioritize a motor carrier for further monitoring.

The symbol is not intended to imply any federal safety rating of the carrier pursuant to 49 USC 31144. Readers should not draw conclusions about a carrier's overall safety condition simply based on the data displayed in this system. Unless a motor carrier in the SMS has received an UNSATISFACTORY safety rating pursuant to 49 CFR Part 385, or has otherwise been ordered to discontinue operations by the FMCSA, it is authorized to operate on the nation's roadways.

Motor carrier safety ratings are available at http://safer.fmcsa.dot.gov and motor carrier licensing and insurance status are available at http://li-public.fmcsa.dot.gov/.