I'm watching video just now, and it appears that the entire highway does not need to be closed.  Taking "alternate routes" is not really possible, as there really aren't any, and I'm sure the residential areas don't appreciate having people wandering through their neighborhoods, looking for a way home.  This points out the need for the Metro to have more through streets, so that people don't have to rely so heavily on one highway.  They're telling people to cut over to Parker Road.  Are they kidding?  Have you ever seen the traffic already on that road during the rush hour?  (Another problem road.)