This is the URL for an Open511 service type. They’re used on Open511 discovery resources and are identify the API specification that the specific service follows – the same logic, roughly, as an XML namespace.

If you followed this link from a discovery page looking to access data from a specific Open511 API, the link you want is the one that was right beside this one – <link rel="self"> in XML, or the url key in JSON. That leads to the implementation of the API that follows this specification.

This service type is for road events, and full documentation is available here.