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U.S. Department of Transportation/Federal Highway Administration
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What is the WZDx Specification?

The Work Zone Data Exchange (WZDx) Specification enables infrastructure owners and operators (IOOs) to make harmonized work zone data available for third party use. The intent is to make travel on public roads safer and more efficient through ubiquitous access to data on work zone activity. Specifically, the project aims to get data on work zones in to vehicles to help automated driving systems (ADS) and human drivers navigate more safely.​​

Why is WZDx being developed?

Improving access to work zone data is one of the top needs identified through the US Department of Transportation (USDOT) Data for Automated Vehicle Integration (DAVI) effort.​​

Up-to-date information about dynamic conditions occurring on roads – such as construction events – can help ADS and humans navigate safely and efficiently. Many IOOs maintain data on work zone activity. However, a lack of common data standards and convening mechanisms makes it difficult and costly for third parties – including original equipment manufacturers (OEMs) and navigation applications – to access and use these data across various jurisdictions.​

Thus, inspired by GTFS, USDOT launched WZDx to jumpstart the voluntary adoption of a basic work zone data specification through collaboration with data producers and data users. Longer term, the goal is to enable collaborative maintenance and expansion of the specification to meet the emerging needs of ADS.

Who is involved in developing WZDx?

The Federal Highway Administration (FHWA) and Intelligent Transportation Systems Joint Program Office (ITS JPO) co-led the early stages of the WZDx project and remain actively involved along with the Bureau of Transportation Statistics (BTS) and others in the USDOT. Several data producers and data users voluntarily developed WZDx v1.1 of the specification in collaboration with USDOT and have started to set up data feeds based on it.

Going forward, the Work Zone Data Working Group (WZDWG), established under the Federal Geographic Data Committee (FGDC) Transportation Subcommittee (TSC) will maintain the specification with the goal of publishing incremental updates to refine the features, attributes, and vocabulary needed to model work zone activity data. Currently, the WZDWG’s priority is to update WZDx v1.1, developing version 2.0 of the specification based on lessons learned from v1.1 and new insights from the user community.​

Additional Resources

Download the WZDX postcard.​​