The HL segment identifies the hierarchical relationship of commercial vehicle safety information carried by the transaction. A Report parent level is required for all reports. An Inspection Report may have child levels Event, Company, Shipment, Product Description, Component, Person, Transportation Equipment, Violation. A Compliance Review may have child levels Company, Fleet, Violation, Safety Factor, Safety Fitness, Support Document, Review History, Recommendation. Company may have Product Description child levels. A Hazardous Materials Incident may have child levels Event, Company, Shipment, Traffic Unit, Property. Event may have a Response child level. Shipment may have Product Description child levels. Traffic Unit may have child levels Person, Transportation Equipment. Person may have a Nature of Injury child level. Product Description may have Container child levels. An Accident Report may have child levels Event, Reference Location, Traffic Unit, Property. Traffic Unit may have child levels Transportation Equipment, Person, Shipment. Transportation Equipment may have child levels Action, Damage, Person. Person may have child levels Action, Nature of Injury. Shipment may have Product Description child levels.

0200PaperworkOptional->Max 1

To identify the type or transmission or both of paperwork or supporting information

0300Extended Reference InformationOptional->Max >1

To transmit identifying information as specified by the Reference Identification Qualifier

0400Date/Time ReferenceOptional->Max >1

To specify pertinent dates and times

0500Yes/No QuestionOptional->Max >1

To identify and answer yes and no questions, including the date, time, and comments further qualifying the condition

The YNQ provides responses to conditions relating to the entity specified in 2/0100.

0600CommodityOptional->Max 1

To identify a commodity or a group of commodities or a tariff page commodity

0700Hazardous MaterialOptional->Max 1

To specify information relative to hazardous material

0800Hazardous Classification InformationOptional->Max 1

To specify the hazardous notation and endorsement information

0900Hazardous Material Shipping Name InformationOptional->Max 1

To specify the hazardous material shipping name and additional descriptive requirements

1000Item Physical DetailsOptional->Max 1

To specify the physical qualities, packaging, weights, and dimensions relating to the item

1100Marks and Numbers InformationOptional->Max >1

To indicate identifying marks and numbers for shipping containers

LQ Loop Optional

Repeat >1

1200Industry Code IdentificationMandatory->Max 1

To identify standard industry codes

The LQ loop provides report data in coded form.

1300Extended Reference InformationOptional->Max >1

To transmit identifying information as specified by the Reference Identification Qualifier

1400Yes/No QuestionOptional->Max >1

To identify and answer yes and no questions, including the date, time, and comments further qualifying the condition

The YNQ provides responses to conditions relating to the data specified in 2/1200.

1500MeasurementsOptional->Max >1

To specify physical measurements or counts, including dimensions, tolerances, variances, and weights (See Figures Appendix for example of use of C001)

1600InformationOptional->Max >1

To report information

1700Quantity InformationOptional->Max 1

To specify quantity information

1800Location DescriptionOptional->Max 1

To provide a general description of the area where an entity is located

1900Test ScoresOptional->Max 1

To provide scores on tests that a student has taken

2000Vehicle InformationOptional->Max 1

To provide descriptions that identify a specific vehicle

2100Dynamic Vehicle InformationOptional->Max >1

To provide dynamic information pertaining to a vehicle

AMT Loop Optional

Repeat >1

2200Monetary Amount InformationMandatory->Max 1

To indicate the total monetary amount

2300Date/Time ReferenceOptional->Max >1

To specify pertinent dates and times

NM1 Loop Optional

Repeat >1

2400Individual or Organizational NameMandatory->Max 1

To supply the full name of an individual or organizational entity

The NM1 loop identifies the entity reporting or receiving the data, the entities involved in the event, or the location of the event.

2500Additional Name InformationOptional->Max 2

To specify additional names

2600Party LocationOptional->Max 2

To specify the location of the named party

2700Geographic LocationOptional->Max 1

To specify the geographic place of the named party

2800Extended Reference InformationOptional->Max >1

To transmit identifying information as specified by the Reference Identification Qualifier

2900Administrative Communications ContactOptional->Max >1

To identify a person or office to whom administrative communications should be directed

3000Employment PositionOptional->Max 1

To describe employment position

3100Demographic InformationOptional->Max >1

To supply demographic information

3200Additional Demographic InformationOptional->Max 1

To supply additional demographic identification

3300Date/Time ReferenceOptional->Max >1

To specify pertinent dates and times

3400Yes/No QuestionOptional->Max >1

To identify and answer yes and no questions, including the date, time, and comments further qualifying the condition

The YNQ provides responses to conditions relating to the entity specified in 2/2400.

LIE Loop Optional

Repeat >1

3500Individual or Event LocationMandatory->Max 1

To provide an accurate description of where an individual was located or an event took place

3600MeasurementsOptional->Max 1

To specify physical measurements or counts, including dimensions, tolerances, variances, and weights (See Figures Appendix for example of use of C001)

MTX Loop Optional

Repeat >1

3700TextMandatory->Max 1

To specify textual data

3800Reference InformationOptional->Max >1

To specify identifying information

3900Transaction Set TrailerMandatory->Max 1

To indicate the end of the transaction set and provide the count of the transmitted segments (including the beginning (ST) and ending (SE) segments)