SLIDE 1
Corner Stone
International
Sagl.
2 Presentation NIWS-Project
Content
- 1. Background + Approach
- 2. Scope, Application and Structure
- 3. Weighing Requirements
- 4. Procedures for Testing and Certification
- 5. Benefits of the Standard
NIW S-Pro Project ject NMi International WIM Standard Content 1. - - PowerPoint PPT Presentation
NIW S-Pro Project ject NMi International WIM Standard Content 1. - - PowerPoint PPT Presentation
Corner International Stone Sagl. NIW S-Pro Project ject NMi International WIM Standard Content 1. Background + Approach 2. Scope, Application and Structure 3. Weighing Requirements 4. Procedures for Testing and Certification 5.
SLIDE 2
SLIDE 3
3 Presentation NIWS-Project
Background
3 International standards
Each with own purpose and (dis-)advantages Parts used in Tenders Nothing for Direct Enforcement for HS-WIM
Many National standards
All different Often not practical Barrier for market access
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4 Presentation NIWS-Project
Goal:
International Standard on Weigh-In-Motion Systems
Approach:
Small Group of Experts on WIM and on Standarisation Covering different; Technologies, Vendors, Countries Published as NMI-Standard Start with Blank sheet of paper Guide with Explanation and Motivation
Approach
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5 Presentation NIWS-Project
NIWS-Project:
Cock Oosterman Nederlands Meetinstituut, (NL) Paul Kok Nederlands Meetinstituut, (NL) Mathias Meijer Nederlands Meetinstituut, (NL) Andy Lees Q-free TDC, (UK) Emil Doupal Transport Research Centre, (CZ) Peter Favai Cestel, (Slo) Randy Hanson
- Int. Road Dynamics, (Can.)
Hans van Loo Corner Stone Int., (CH)
Approach
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6 Presentation NIWS-Project
Scope:
Automatic WIM-systems. Performance Requirements Minimum Testing Procedures
Application:
Technology Independent High Speed and Low Speed Statistical and Legal Applications
Document
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7 Presentation NIWS-Project
4 Categories of WIM
Low Speed Controlled Legal Applications OIML R134 High Speed Free Flow Legal Applications OOP (CZ) High Speed Free Flow Statistical Applications COS T
- 323
AS TM E1318 Low Speed Controlled Statistical Applications ??? No Vehicle Dynamics No Lane changes Vehicle Dynamics Lane changes Accuracy of each measurement Specified in MPE Legal Approval by NMi Accuracy of average measurement Specified in Standard Deviation Buyer-Vendor relation
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8 Presentation NIWS-Project
I. General
Terminology + Operating Conditions
- II. Statistical Applications
Specifications + Test Protocols
- III. Legal Applications
Specifications + Test Protocols
- IV. Recommendations (non mandatory)
Site selection + Example test protocols
Document Structure
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9 Presentation NIWS-Project
Ranges for:
Vehicle Speed, overlapping ranges Temperature* ; -25 C to +55 C Relative Humidity* ; 95% at +55 C Electromagnetic Fields* Mains Voltage Variations* * Based on OIML D11; General requirements for measuring instruments
No requirements for:
Road Conditions or Durability
Operating Conditions
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10 Presentation NIWS-Project
Vehicle Record Completeness Accuracy requirements for:
Completion Rate Length Measurements Classification Rate
Resolution requirements for:
Date + Time Recording Speed Recording
Technical Requirements
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11 Presentation NIWS-Project
Statistical Applications:
S(x)
[-2 ,+2 ] interval Includes 95% of measurements
Weighing Requirements
Class S(5) S(7) S(10) S(15) S(20)
GVW 5 7 10 15 20 Axle Group 8 11 15 20 25 Axle Load 10 15 20 25 30
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12 Presentation NIWS-Project
Legal Applications:
L(x)
[-MPE,+MPE] interval Includes 100% of measurements
Weighing Requirements
Class L(3) L(5) L(7) L(10)
GVW 3 5 7 10 Axle Group 5 8 11 15 Axle Load 7 10 15 20
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13 Presentation NIWS-Project
Statistical Applications
2 Test Levels; (Initial Verification, In-service Verification) Relation between Buyer and Vendor
Legal Applications
3 Test Levels; (Type Approval, Initial Verification, In-service Verification) Independent Legal Approval required Testing and Certification by NMi
- r National Authority approved by NMi
Test Procedures
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14 Presentation NIWS-Project
Test Procedures
Type Approval
Lab Tests Field Tests In-Service Verification
Initial Verification
Type Approval Certificate System Approval Certificate In-Service Certificate System
- no. 1
System
- no. 2,3,etc.
Field Tests Field Tests System
- no. 1,2,3,etc.
System Approval Certificate for no.1
New type of system Major maintenance Every x months
Example: Legal Applications; 3 levels of testing
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15 Presentation NIWS-Project
Field Tests
Most common Types of Vehicles Fully Loaded only
Test Procedures
Test / Application Type Approval Initial Verification In-Service Verifcation
Statistical
n.a. 2 Vehicles, 10 runs each T
- tal: 20 runs
1 Vehicle, 10 runs T
- tal: 10 runs
Legal
3 Vehicles, 30 runs each T
- tal: 90 runs
2 Vehicles, 30 runs each T
- tal: 60 runs
2 Vehicles, 15 runs each T
- tal: 30 runs
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16 Presentation NIWS-Project
Combination of:
Statistical and Legal Applications High Speed and Low Speed systems Requirements, Test Protocols and Framework for Certification Standard and Informative Guide
Independent of:
Technology / Type of Sensors Vendor / Manufacturer User / Country
Benefits
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17 Presentation NIWS-Project
Practical:
Short and Simple, Clear Structure, easy to use Based on >100 years of combined experience
Balance between:
Interests of Vendors and Buyers Weighing-In-Motion and Legal Metrology
E.g. Number of test runs should be: Large enough to provide sufficient confidence Small enough to be realistic in daily practice
Benefits
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18 Presentation NIWS-Project
Open Standard:
Use is free of charge Registration at NMi-website Voluntary use of standard
As reference In tenders
More information:
www.nmi.nl www.corner-stone-int.com