@Frank-8h, No one will ever offer better traffic information than Google. They monitor Android phones and can conclude from the absence of traffic that the road is closed. All others are dependent on local governments to submit data about road closures.
The anecdote about this is that someone gathered all phones from friends and family, put it in a shopping cart and walked down the street. In about 5 minutes the road showed as jammed on Google Maps 
But closed roads are such a pain when you can't reach your destination without driving 2 hours more than expected....
Must be one heck of a hefty road closure then...