Reminds me a bit how Speed camera apps (and radar detection) has fluctuated between being legal and illegal. The police seems to view them as disruption to their work (and by extension, road safety), and view it similar to as if a person would physically prevent the police from doing their job.

If a driver is forbidden from using an app to identify where a speed camera is, I would suspect they are equally forbidden from using an app that identify a roadblock, but I guess it would depend if the law specify it.