Safety Measurement System - Complete SMS Profile (U.S. DOT# 4459321)

CHON TRUCKING INC

U.S. DOT#: 4459321

Address: 1535 ABBOT AVE APT A
SAN GABRIEL, CA 91776
Number of Vehicles: 1
Number of Drivers: 1
Number of Inspections: 4

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 July 31, 2026

On-Road Performance
0 Measure	Not Public	0.27 Measure	9.81 Measure	0 Measure	Not Public	1.63 Measure
On-Road Performance Detail
Driver Inspections with Unsafe Driving Violations: 0 Safety Event Group: No Safety Event Grouping Avg. PU × UF: 1.2 Segment: Combination Carrier	Not Public	Driver Inspections: 4 with HOS Compliance Violations: 1 Safety Event Group: 3-10 relevant driver inspections	Vehicle Inspections: 4 with Vehicle Maint. Violations: 2 Safety Event Group: No Safety Event Grouping	Driver Inspections: 4 with Drugs/Alcohol Violations: 0 Safety Event Group: No Safety Event Grouping	Not Public	Driver Inspections: 4 with Driver Fitness Violations: 1 Safety Event Group: No Safety Event Grouping
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: 12


Violations	Description	# Violations	# OOS Violations	Violation Severity Weight	BASIC

395.24	HOS (ELD) - ELD Form and Manner	1	0	1	HOS Compliance
391.11B2-Q	Driver cannot satisfy the English language proficiency requirements of 391.11(b)(2) as per FMCSA Enforcement Guidance Memo MC-SEE-2025-0001. Driver failed the Interview.	1	1	4	Driver Fitness
392.2-SLLMF	State/Local Laws - Wheel (mud) flaps missing or defective	1	0	1	Vehicle Maint.
393.11A1-LCHL	Lighting - Lamps improper color, height, location.	1	0	6	Vehicle Maint.
393.11A1-LRR	Lighting - Reflex reflector(s) missing or improper	1	0	3	Vehicle Maint.
393.205C-WRAWFLMIB	Wheel/Rim - Any wheel fasteners loose/missing/ineffective/broken.	1	0	2	Vehicle Maint.
393.43E-BBST	Brake - Bleedback system is defective on trailer	1	0	4	Vehicle Maint.
393.47(e)	Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt	1	0	4	Vehicle Maint.
393.48A-BLMACBD	Drum Brake - Loose chamber/spider/camshaft support bracket	1	1	4	Vehicle Maint.
393.53B-B	Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear	1	0	4	Vehicle Maint.
393.9A-LHLI	Lighting - Headlamp(s) - Any inoperative	1	0	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.

Inspection History

Total Inspections: 4


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

7/13/2026	CAUD6V001647	CA	ZP76312	CA	TRUCK TRACTOR		3
Driver Fitness Violation: 391.11B2-Q Driver cannot satisfy the English language proficiency requirements of 391.11(b)(2) in accordance with the current corresponding FMCSA enforcement guidance (391. (OOS)						4 + 2 (OOS)
Vehicle Maint. Violation: 393.48A-BLMACBD Drum Brake - Loose chamber/spider/camshaft support bracket (OOS)						4 + 2 (OOS)
7/13/2026	CAUE03005052	CA	ZP76312	CA	TRUCK TRACTOR		3
4/7/2026	AZXB56741066	AZ	ZP76312	CA	TRUCK TRACTOR		3
Vehicle Maint. Violation: 393.11A1-LRR Lighting - Reflex reflector(s) missing or improper						3
Vehicle Maint. Violation: 392.2-SLLMF State/Local Laws - Wheel (mud) flaps missing or defective						1
Vehicle Maint. Violation: 393.53B-B Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear						4
Vehicle Maint. Violation: 393.11A1-LCHL Lighting - Lamps improper color, height, location.						6
Vehicle Maint. Violation: 393.205C-WRAWFLMIB Wheel/Rim - Any wheel fasteners loose/missing/ineffective/broken.						2
HOS Compliance Violation: 395.24 HOS (ELD) - ELD Form and Manner						1
Vehicle Maint. Violation: 393.9A-LHLI Lighting - Headlamp(s) - Any 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
Vehicle Maint. Violation: 393.43E-BBST Brake - Bleedback system is defective on trailer						4
10/22/2025	CAN91G006821	CA	ZP45129	CA	TRUCK TRACTOR		2

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:
Total Inspections: 4
- Total Inspections without Violations used in SMS: 2
- Total Inspections with Violations used in SMS: 2
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 08/12/2026 updated monthly from FMCSA )

No penalties found

Tools/Resources

SMS Methodology How to Improve Request a Data Review

For U.S. DOT# 4459321

Complete SMS Profile Carrier History Downloads

Summary of Activities (as of 7/31/2026, updated monthly)

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

Most Recent Investigation: None	Total Inspections: 4 Total inspections without violations used in SMS: 2 Total inspections with violations used in SMS: 2	Total Crashes: 0*
	# Insp. OOS Driver Inspections 4 25.0% Vehicle Inspections 4 50.0% 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

Select a focus and file type to download SMS data.

Focus:
File Type:

Average PU × Utilization Factor (as of 7/31/2026, 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.

1.2 Average PU × Utilization Factor = 1 Average Power Units × 1.15 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.

1 Average Power Units = 1 Current Power Units + 1 Power Units 6 Months Ago + 0 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: Combo
Combination trucks/motor coach buses constituting 70% or more of the total PU
U.S. DOT# 4459321 = 100% Combination trucks/motor coach buses
Determine VMT per Average Power Unit
100,000 VMT per Average Power Unit = 100,000 VMT From Registration (MCS-150) ÷ 1 Average Power Units

Based on Step 1 and 2 calculate the Utilization Factor

Combo Segment
Meets Criteria	VMT per Avgerage PU	Utilization Factor
	< 80,000	1
	80,000 – 160,000	1.15 = 1 + ( 100,000 VMT per PU − 80,000) ÷ 133,333
	160,000 – 200,000	1.6
	> 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/.