BS EN 16157-4:2021

What is BS EN 16157‑4 about?  

BS EN 16157‑4 is the fourth part of the DATEX II European Standard which deals with the publication sub-models within the DATEX II model that support the exchange of variable message sign information. 

BS EN 16157‑4 specifies the informational structures, relationships, roles, attributes and associated data types which helps you publishing variable message sign information within the DATEX II framework. It specifies the structures and definitions of information that can be exchanged to convey details of the messages displayed on variable message signs, the current configuration, characteristics and status of the variable message signs that are currently deployed on the road network. 

BS EN 16157‑4 is specified in two sub-models, a DATEX II VMS Table Publication sub-model, and a DATEX II VMS Publication sub-model.  

NOTE- BS EN 16157‑4 is not intended to support the control or configuration of VMS equipment. 

Who is BS EN 16157‑4 for? 

BS EN 16157‑4 on intelligent transport systems using DATEX II is useful for: 

• Traffic management department 
• Traffic regulation authorities 

Why should you use BS EN 16157‑4?  

Standardization in BS EN 16157‑4 is a vital constituent to ensure interoperability, reduction of risk, reduction of the cost base, promotion of open marketplaces, and many social, economic, and community benefits to be gained from more informed travellers, network managers, and transport operators. 

BS EN 16157‑4 is intended to support you in the exchange of status and informational content concerning VMS from the organization controlling the VMS to other organizations providing ITS services or onward information exchange.  

BS EN 16157‑4 provides a common set of data exchange specifications to support the vision of seamless interoperable exchange of traffic and travel information across boundaries, including national, urban, interurban, road administrations, infrastructure providers, and service providers. It simplifies the process of publishing variable message sign information within the DATEX II framework. 

What’s changed since the last update?  

BS EN 16157‑4:2021 supersedes CEN/TS 16157-4:2014. BS EN 16157‑4:2021 includes some technical changes with respect to CEN/TS 16157-4:2014. These include: 

• Renaming of some classes (e.g. currently renamed Vms, Vms Controller, Vms Controller Status,Vms Status) to improve the understanding and the usage of the modelled information 
• Merging of VMS characteristics and VMS configuration in the same model to address static and dynamic configuration as well as Vms Message package restructured enhancing the model flexibility for inclusion of dynamic configured VMS, e.g. “Full-Matrix” VMS 
• Compliance to ISO 14823:2017 - Intelligent transport systems – Graphic data dictionary, for description of Pictogram graphical information 
• Correction of several bugs