Adverse　weather　and　poor　road　conditions　are　two　major　factors　which　result　in　traffic　accidents.　The　main　adverse　weather　conditions　are　rain,　snow,　fog,　and　ice　which　will　reduce　the　roads＇　friction　coefficient　and　drivers＇　visibility.　Poor　road　alignment　can　include　sharp　bends,　steep　slopes,　and　poor　visibility,　which　may　influence　operational　smoothness　and　vehicle　controllability.　This　paper　focuses　on　methods　to　ensure　traffic　safety　of　low-grade　roads　under　adverse　weather　conditions.　We　studied　the　classification　of　adverse　weather　and　the　identification　of　hidden　danger　segments　in　Inner　Mongolia.　Then,　we　used　an　evaluating-point　approach　to　calculate　the　risk　values　under　adverse　weather　conditions　and　divides　risk　into　five　levels.　Then,　the　paper　proposes　control　measures,　such　as　traffic　diversion,　traffic　organization,　speed　limits,　and　roads　access　closures.　This　study　is　very　important　for　traffic　control　in　Inner　Mongolia　under　adverse　weather　conditions.　©　ASCE.