TranStar says an accident if I read it right http://traffic.houstontranstar.org/layers/layers_ve.aspx?x=29.6578&y=-95.3870&z=15&inc=true
Reports are an officer was killed in a head on collision with an intoxicated driver, but I believe that was at like 3am.
So it's a motorcycle cop accident that's working the deceased cop's funeral procession? Geez, I'd hate to be whoever caused that accident.