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eLibrary > NEMA TS4 2023 Hardware Standards for Dynamic Message Signs (DMS) with NTCIP Requirements >

NEMA TS4 2023 Hardware Standards for Dynamic Message Signs (DMS) with NTCIP Requirements, 2023

Section 1 General [Go to Page]
1.1 Scope and Introduction
1.2 References [Go to Page]
1.2.1 Normative References
1.2.2 Informative References
1.2.3 Contacts [Go to Page]
1.2.3.1 American Association of State Highway and Transportation Officials (AASHTO)
1.2.3.2 American Society for Testing and Materials (ASTM)
1.2.3.3 American Welding Society (AWS)
1.2.3.4 International Commission on Illumination (CIE)
1.2.3.5 Institute of Printed Circuits (IPC)
1.2.3.6 National Electrical Manufacturers Association (NEMA)
1.2.3.7 National Highway Traffic Safety Administration (NHTSA)—FMVSS
1.2.3.8 National Transportation Communications for ITS (Intelligent Transportation System) Protocol (NTCIP) Standards
1.2.3.9 Occupational Safety and Health Administration (OSHA)
1.2.3.10 Society of Automotive Engineers (SAE)
1.2.3.11 Underwriters Laboratories (UL)
1.3 General Statements
1.4 Types of CMS [Go to Page]
1.4.1 Changeable Message Signs (CMS)
1.4.2 Types of DMS Displays
1.4.3 Types of VMS Displays
1.4.4 Type of VMS and DMS Mechanical Construction
1.4.5 Blank-Out Signs (BOS)
1.5 Types of Technologies
1.6 Definitions, Terms, and Acronyms
Section 2 Environmental Requirements [Go to Page]
2.1 Environmental and Operating Standards [Go to Page]
2.1.1 Definitions of Major Units of the DMS or VMS Equipment
2.1.2 Compliance of Major Units
2.1.3 Electrical [Go to Page]
2.1.3.1 Voltages
2.1.3.2 Operating Frequency
2.1.3.3 Power Interruption for AC Services [Go to Page]
2.1.3.3.1 General AC Power Items
2.1.3.3.2 DMS or VMS Controller Power Interrupts
2.1.3.4 Power Interruption for DC Supply Service [Go to Page]
2.1.3.4.1 General DC Power Items
2.1.3.4.2 DMS or VMS Controller Power Interrupts
2.1.4 Transients [Go to Page]
2.1.4.1 Power Transient
2.1.4.2 Electro-Static Discharge (ESD)
2.1.4.3 Radio Interference
2.1.5 Temperature and Humidity [Go to Page]
2.1.5.1 Ambient Temperature
2.1.5.2 Humidity
2.1.6 Vibration
2.1.7 Shock
2.1.8 Time and Timing [Go to Page]
2.1.8.1 Timing Accuracy and Deviation [Go to Page]
2.1.8.1.1 Display Time Attributes
2.1.8.1.2 Real Time Clock Accuracy
2.1.8.1.3 Real Time Clock Precision
2.1.8.2 Set Ability and Repeatability
2.2 DMS Equipment Tests [Go to Page]
2.2.1 Test Facilities (Except Vibration and Shock) [Go to Page]
2.2.1.1 Environmental Chamber
2.2.1.2 Transient Generator(s)
2.2.2 Test Unit
2.2.3 Test Functions [Go to Page]
2.2.3.1 Test A: Low-Temperature Low-Voltage Tests [Go to Page]
2.2.3.1.1 Definition of Test Conditions
2.2.3.1.2 Test Procedure
2.2.3.2 Test B: Low-Temperature High-Voltage Tests [Go to Page]
2.2.3.2.1 Definition of Test Conditions
2.2.3.2.2 Test Procedure
2.2.3.3 Test C: High-Temperature High-Voltage Tests with Humidity [Go to Page]
2.2.3.3.1 Definition of Test Conditions
2.2.3.3.2 Test Procedure
2.2.3.4 Test D: High-Temperature Low-Voltage Tests with Humidity [Go to Page]
2.2.3.4.1 Definition of Test Conditions
2.2.3.4.2 Test Procedure
2.2.3.5 Test E: Test Termination
2.2.3.6 Test F: Appraisal of Test Unit
2.2.4 Test G: Vibration Test [Go to Page]
2.2.4.1 Test Equipment Requirements
2.2.4.2 Resonant Search
2.2.4.3 Endurance Test
2.2.4.4 Disposition of Equipment Under Test
2.2.5 Test H: Shock (Impact) Test [Go to Page]
2.2.5.1 Test Equipment Requirements
2.2.5.2 Test Procedure
2.2.5.3 Disposition of Test Unit
2.2.6 Test J: Power Interrupt Tests [Go to Page]
2.2.6.1 120 VAC Power Interruption Tests [Go to Page]
2.2.6.1.1 Continuous Power Interruptions
2.2.6.1.2 Slow Varying Input Voltage
2.2.6.2 240 VAC Power Interruption Tests [Go to Page]
2.2.6.2.1 Continuous Power Interruptions
2.2.6.2.2 Slow Varying Input Voltage
2.2.6.3 DC Power Interruption Tests
2.2.7 Test K: Timing Accuracy Tests [Go to Page]
2.2.7.1 Standard Time Clock
2.2.7.2 Timing Ranges
2.2.7.3 Set Ability
2.2.7.4 Repeatability
Section 3 DMS or VMS Mechanical Construction [Go to Page]
3.1 General [Go to Page]
3.1.1 Weather-Tight Enclosure [Go to Page]
3.1.1.1 Water and Dust Resistance
3.1.1.2 Access Panel and Doorway Gaskets
3.1.1.3 Vents and Filters
3.1.1.4 Documentation Package
3.1.2 Temperature Control [Go to Page]
3.1.2.1 Ventilation Considerations for Housings that May Be Entered
3.1.2.2 Temperature Considerations for Continued DMS or VMS Operation
3.1.3 DMS or VMS Face [Go to Page]
3.1.3.1 DMS or VMS Face Material
3.1.3.2 DMS or VMS Face Condensation
3.1.4 Galvanic Protection
3.1.5 Light Leaks
3.1.6 Contrast Border
3.2 Fixed-Location DMS or VMS [Go to Page]
3.2.1 Design Life of Fixed DMS or VMS
3.2.2 Structural Integrity [Go to Page]
3.2.2.1 Loadings
3.2.2.2 Lifting Eyes
3.2.2.3 Storage Provisions
3.2.3 Aluminum Housings [Go to Page]
3.2.3.1 Alloys and Structural Members
3.2.3.2 Exterior Housing Finish
3.2.4 Housings Made of Other Materials
3.2.5 Front and Rear Access
3.2.6 Front Access DMS or VMS
3.2.7 Rear Access DMS or VMS
3.2.8 Walk-In Access DMS or VMS [Go to Page]
3.2.8.1 Access Door(s)
3.2.8.2 Work Area
3.2.8.3 Service Lighting
3.2.9 Convenience Outlets, Walk-In Access
3.3 Portable DMS or VMS [Go to Page]
3.3.1 Transport Safety
3.3.2 Structural Integrity [Go to Page]
3.3.2.1 Loading [Go to Page]
3.3.2.1.1 GVW Load
3.3.2.1.2 Wind Load [Go to Page]
3.3.2.1.2.1 Maximum Destructive Loadings
3.3.2.1.2.2 Maximum Overturning Loadings
3.3.2.2 Welding
3.3.3 Major Subsystems [Go to Page]
3.3.3.1 Sign [Go to Page]
3.3.3.1.1 Sign Lift and Support
3.3.3.1.2 Sign Positioning
3.3.3.2 Axles and Tires
3.3.3.3 Fenders
3.3.3.4 Leveling
3.3.3.5 Tongue and Coupler
3.3.3.6 Non-Slip Surface
3.3.3.7 Sign Maintenance Access
3.3.3.8 Operator Light
3.3.4 Corrosion Protection and Finishes
3.3.5 Power Sources [Go to Page]
3.3.5.1 Photovoltaic (PV) Panels
3.3.5.2 Batteries
3.3.5.3 110 VAC
Section 4 Controller to DMS or VMS Interface [Go to Page]
4.1 Interface with DMS or VMS Housing
4.2 Wiring
4.3 Wire Entrances
4.4 Pixel Control Wiring [Go to Page]
4.4.1 Power Supply Locations [Go to Page]
4.4.1.1 Permanent Installation AC or DC Power Supplies in Cabinet Other than DMS or VMS Cabinet
4.4.1.2 Permanent Installation AC or DC Power Supplies in DMS or VMS Cabinet
4.4.1.3 Portable Solar/Battery Powered DMS or VMS
4.4.1.4 Battery Chargers for Solar/Battery Powered DMS or VMS
4.4.2 DMS or VMS Controller and Driver Module Locations [Go to Page]
4.4.2.1 DMS or VMS Controller in DMS or VMS
4.4.2.2 DMS or VMS Controller Separate from DMS or VMS Cabinet
Section 5 Display Properties [Go to Page]
5.1 General [Go to Page]
5.1.1 Development Sources
5.1.2 Legibility Versus Visibility
5.1.3 Photometric and Colorimetric Requirements
5.2 Contrast Ratio
5.3 Cone of Vision Type Classification [Go to Page]
5.3.1 Light Emitting Technology [Go to Page]
5.3.1.1 Daytime
5.3.1.2 Nighttime
5.4 Luminance Intensity Requirements [Go to Page]
5.4.1 Luminous Intensity Uniformity
5.5 Chromaticity Classifications and Limits [Go to Page]
5.5.1 Chromaticity Limits [Go to Page]
5.5.1.1 Light Emitting Technology
5.5.2 Chromaticity Uniformity
5.5.3 Traffic Control Applications
5.6 Display Characters [Go to Page]
5.6.1 Fonts and Font Alphabets
5.6.2 Required Fonts by DMS or VMS Type [Go to Page]
5.6.2.1 Character Matrix Signs
5.6.2.2 Line Matrix Signs
5.6.2.3 Full Matrix [Go to Page]
5.6.2.3.1 Character Height
5.6.2.3.2 NEMA TS 4 Fonts/Character Ratios (Width/Stroke/Spacing)
5.6.2.3.3 MUTCD Fonts—Character Ratios (Width/Stroke/Spacing)
5.6.2.3.4 Calculating Character Sizes [Go to Page]
5.6.2.3.4.1 Character Width
5.6.2.3.4.2 Character Spacing
5.6.2.3.4.3 Interline Spacing
5.6.2.3.4.4 Character Stroke Width
5.7 Display Change Time
5.8 Moving Arrows
5.9 Test Methods [Go to Page]
5.9.1 General Test Parameters [Go to Page]
5.9.1.1 Geometric Configuration of Test Equipment
5.9.1.2 Solar Simulator Used for Illumination
5.9.1.3 Tolerance to the Solar Simulator Off-Axis Angle
5.9.1.4 Coefficient of Retroreflection
5.9.2 Test Area
5.9.3 Considerations for Precision and Bias of Test Methods and Accuracy of Test Results
Section 6 Optical Components [Go to Page]
6.1 General [Go to Page]
6.1.1 Pixel Spacing
6.1.2 Character Module Spacing [Go to Page]
6.1.2.1 Fixed Location Character Matrix DMS or VMS
6.1.2.2 Portable Character Matrix DMS or VMS
6.1.2.3 Fixed Location Line Matrix DMS or VMS
6.1.2.4 Portable Line Matrix DMS or VMS
6.1.2.5 Full Matrix DMS or VMS
6.1.3 Interchangeability of LED Modules
6.1.4 Character Replacement
6.2 LED Light System [Go to Page]
6.2.1 General
6.2.2 LED Selection
6.2.3 LED Use [Go to Page]
6.2.3.1 LED Light System
6.2.3.2 Autonomous Vehicle Consideration
Section 7 DMS or VMS Controller Cabinet [Go to Page]
7.1 General
7.2 DMS or VMS Controller Cabinet Design [Go to Page]
7.2.1 Layout
7.2.2 Protection
Section 8 Electronics and Electrical [Go to Page]
8.1 General
8.2 Components [Go to Page]
8.2.1 General
8.2.2 Wiring, Cabling, and Harnesses
8.2.3 Circuit Loading, Surge Protection, and Disconnects
8.2.4 Printed Circuit Boards
8.3 DMS or VMS Controller [Go to Page]
8.3.1 General
8.3.2 Communication Interfaces
8.3.3 Communications
8.3.4 Internal Clock
8.3.5 Watchdog Timer
8.3.6 Loss of Power
8.3.7 Communications Link Monitor
8.3.8 Manual Test Interface
8.3.9 Controller Reset
8.4 Controller Functions [Go to Page]
8.4.1 General
8.4.2 Control Architectures [Go to Page]
8.4.2.1 Centralized Messaging
8.4.2.2 Local Messaging
8.4.3 Common Functionality [Go to Page]
8.4.3.1 Display Modes
8.4.3.2 Recording and Logging
8.4.3.3 Access Rights
8.4.3.4 Stored Messages
8.4.4 Centralized Messaging Architecture [Go to Page]
8.4.4.1 General
8.4.4.2 Message Libraries
8.4.5 Local Messaging Architecture [Go to Page]
8.4.5.1 Message Libraries
8.4.5.2 Message Scheduling
8.4.6 Display Writing [Go to Page]
8.4.6.1 Display Writing Control
8.4.7 NTCIP Protocol and Command Sets
8.4.8 Other Protocols and Command Sets
8.5 Local Control
Section 9 Performance Monitoring [Go to Page]
9.1 Display Diagnostics and Monitoring [Go to Page]
9.1.1 LED Pixel Tests
9.1.2 LED Temperature Monitor
9.1.3 Brightness Controls [Go to Page]
9.1.3.1 Ambient Light Sensing and Dimming Control
9.2 Controller Diagnostics and Monitoring [Go to Page]
9.2.1 Watchdog Timer
9.2.2 Results of Controller Failures
9.2.3 Power Line Failures
9.2.4 Communication Link Failures
9.2.5 Subsystem Component Communications
9.3 Error and Failure Log
9.4 Message Verification
9.5 Defective Character Module
Section 10 Power Requirements [Go to Page]
10.1 AC or DC Electrical Service
10.2 Power Panels for AC Only [Go to Page]
10.2.1 Minimum Requirements
10.2.2 Service Drop Advisory
10.3 Distribution Panels for DC
10.4 Ground to Neutral Isolation
10.5 Surge Protection Device
10.6 Convenience Outlets AC Only [Go to Page]
10.6.1 Calculated Electrical Load
10.7 Reserve Power Source
10.8 DMS or VMS Operation [Go to Page]
10.8.1 Content/Message
10.8.2 Message Brightness
10.8.3 Definition of Critical Versus Non-Critical Loads
10.9 Reserve Power Source Sizing Considerations [Go to Page]
10.9.1 UPS/Battery [Go to Page]
10.9.1.1 System Voltage Window [Go to Page]
10.9.1.1.1 Load on the Battery
10.9.1.1.2 UPS Reserve Power Design Duration
10.9.1.1.3 Design and Aging Margins
10.10
Section 11 Conformance [Go to Page]
11.1 General [Go to Page]
11.1.1 Involved Parties
11.1.2 Other
11.2 Conformance Document Types [Go to Page]
11.2.1 Certificates
11.2.2 Conformance Testing
11.2.3 Statement [Go to Page]
11.2.3.1 Conformance Statement
11.2.3.2 Change Statement
11.2.3.3 Conditional Statement
11.2.4 Inspections
11.2.5 Evaluation
11.3 Requirements [Go to Page]
11.3.1 Mandatory
11.3.2 Optional
11.4 Conformance Documentation Requirements
11.5 Conformance Table
11.6 Listings
Section 12 Documentation [Go to Page]
12.1 Drawing Documentation [Go to Page]
12.1.1 System Diagrams
12.1.2 Wiring Diagrams
12.1.3 Mechanical Drawings [Go to Page]
12.1.3.1 DMS or VMS Controller Cabinets
12.1.3.2 DMS or VMS Housing
12.2 Site Specific Documentation [Go to Page]
12.2.1 Conformance Table Checklist
12.2.2 NTCIP MIB File
12.2.3 As-Built Documentation
12.2.4 Configuration Information
12.2.5 Revision Numbers
12.2.6 Test Results
12.2.7 Product Burn-In
12.3 Manuals [Go to Page]
12.3.1 Electronic Copy
12.3.2 Hardcopy
12.3.3 Service
12.3.4 Troubleshooting
12.3.5 Operator’s Manual
12.4 Warranty Documentation [Go to Page]

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