Appendix B NIST Handbook 44 Scales – Item 320-3: Revision 2 Draft Tentative Code Applicable to Weigh-In-Motion Systems Used for Vehicle Enforcement Screening Weigh-In-Motion Systems used for Vehicle Enforcement Screening Draft Code – Application A.1. General. This code applies to systems used to weigh vehicles, while in motion, for the purpose of screening – and sorting the vehicles based on the vehicle weight to determine if a static weighment is necessary. A.2. The code does not apply to weighing systems intended for the collection of statistical traffic data. A.3. The code is intended for field enforcement use only. A.4. Additional Code Requirements. In addition to the requirements of this code, Screening – Systems shall meet the requirements of Section 1.10. General Code. S. Specifications S.1. Design of Indicating and Recording Elements and of Recorded Representations. S.1.1. Ready Indication. The system shall provide a means of verifying that the system is operational and – ready for use. S.1.2. Value of System Division Units. The value of a system division expressed in a unit of weight – “d” shall be equal to: 1, 2, or 5; or a decimal multiple or submultiple of 1, 2, or 5. Examples: divisions may be 10, 20, 50, 100; or 0.01, 0.02, 0.05; or 0.1, 0.2, 0.5, etc. S.1.2.1. Units of Measure. The system shall indicate weight values using only a single unit of – measure. S.1.3. Value of Other Units of Measure. S.1.3.1. Speed. Vehicle speeds shall be measured in miles per hour or kilometers per hour. –
Appendix B NIST Handbook 44 – Scales Item 320-3: Revision 2 Draft Tentative Code Applicable to Weigh-In-Motion Systems Used for Vehicle Enforcement Screening Weigh-In-Motion Systems used for Vehicle Enforcement Screening – Draft Code Application A.1. General. – This code applies to systems used to weigh vehicles, while in motion, for the purpose of screening and sorting the vehicles based on the vehicle weight to determine if a static weighment is necessary. A.2. The code does not apply to weighing systems intended for the collection of statistical traffic data. A.3. The code is intended for field enforcement use only. A.4. Additional Code Requirements. – In addition to the requirements of this code, Screening Systems shall meet the requirements of Section 1.10. General Code. S. Specifications S.1. Design of Indicating and Recording Elements and of Recorded Representations. S.1.1. Ready Indication. – The system shall provide a means of verifying that the system is operational and ready for use. S.1.2. Value of System Division Units. – The value of a system division “d” expressed in a unit of weight shall be equal to: 1, 2, or 5; or a decimal multiple or submultiple of 1, 2, or 5. Examples: divisions may be 10, 20, 50, 100; or 0.01, 0.02, 0.05; or 0.1, 0.2, 0.5, etc. S.1.2.1. Units of Measure. – The system shall indicate weight values using only a single unit of measure. S.1.3. Value of Other Units of Measure. S.1.3.1. Speed. – Vehicle speeds shall be measured in miles per hour or kilometers per hour.
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