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\nVariable Message Signs  \nFinal Version 3 | October 2025  \n[roadguidelines.ie](roadguidelines.ie)  \nTraffic Signs Manual  \nChapter 3 – Variable Message Signs  \nContents  \nPage  \n3.1 Introduction ..................................................................................................................................2  \nUses Of VMS..................................................................................................................................3  \nMessage Signs ...............................................................................................................................3  \n3.2 Types of Variable Message Sign ................................................................................................4  \nNotation ..........................................................................................................................................6  \n3.3 Specific Applications of VMS......................................................................................................7  \nVMS For Speed Limits ...................................................................................................................7  \nUrban Information Signs ................................................................................................................8  \nText Message VMS ........................................................................................................................8  \nGantry Mounted VMS .....................................................................................................................9  \nMobile VMS ....................................................................................................................................9  \n3.4 Messages ....................................................................................................................................11  \nGeneral Principles ........................................................................................................................11  \nText ...........................................................................................................................................11  \nPictograms ...................................................................................................................................12  \n3.5 Design Considerations ..............................................................................................................14  \nSign Face .....................................................................................................................................14  \nLocation ........................................................................................................................................14  \nIrish and European Standards .....................................................................................................17  \nApproval .......................................................................................................................................17  \n3.6 Maintenance................................................................................................................................18  \n3.7 Character Sets ............................................................................................................................19  \nCentring Of Messages..................................................................................................................19  \n3.8 Vehicle Activated Signs.............................................................................................................23  \nSign Faces ...................................................................................................................................23  \nInstallation Guidelines ..................................................................................................................24  \nAppendix 3A Glossary and Abbreviatio","cbCaikey5QnvQ7A6","https://ap.wps.com/l/cbCaikey5QnvQ7A6","pdf",1207080,27,"English","# 3.1 Introduction\n## Uses Of VMS\n## 3.2 Types of Variable Message Sign\n## Notation\n## 3.3 Specific Applications of VMS\n## VMS For Speed Limits\n## Urban Information Signs\n## Text Message VMS\n## Gantry Mounted VMS\n## Mobile VMS\n## 3.4 Messages\n## General Principles\n## Text\n## Pictograms\n## 3.5 Design Considerations\n## Sign Face\n## Location\n## Irish and European Standards\n## Approval\n## 3.6 Maintenance\n## 3.7 Character Sets\n## Centring Of Messages\n## 3.8 Vehicle Activated Signs\n## Sign Faces\n## Installation Guidelines\n## Appendix 3A Glossary and Abbreviations","[{\"question\":\"What is the scope of Chapter 3 for Variable Message Signs (VMS)?\",\"answer\":\"Chapter 3 provides guidance on the various types of Variable Message Sign (VMS) available for use on roads in Ireland. It covers signs made wholly of variable message elements and signs where the variable message is only part of a larger sign.\"},{\"question\":\"How does the manual define “shall/must”, “should”, and “may”?\",\"answer\":\"In this manual, “shall” or “must” indicates a mandatory requirement, “should” indicates a recommendation, and “may” indicates an option.\"},{\"question\":\"Why does Chapter 3 refer to the Transport Infrastructure Ireland VMS Messaging Guidelines 1?\",\"answer\":\"The VMS Messaging Guidelines 1 are updated regularly to incorporate changes in VMS technologies, standards, approved messages, and related aspects. Chapter 3 avoids duplicating that content and points to the relevant areas.\"}]","Traffic Signs Manual - Chapter 3 - Variable Message Signs - Final Version 3 - October 2025 | PDF",68]