The　way　drivers　obtain　road　information　has　evolved　from　using　only　road　guide　signs　to　using　both　road　guide　signs　and　navigation　systems.　However,　the　effectiveness　of　their　separate　and　combination　settings　has　not　yet　been　explored,　making　it　difficult　to　determine　whether　their　configurations　should　be　optimized.　This　study　explores　the　effectiveness　of　road　guide　signs,　navigation　systems,　and　their　combination.　First,　a　driving-simulation　experiment　was　conducted.　Subsequently,　four　objective　indicators　based　on　driving　behavior　rather　than　subjective　or　attitudinal　indicators　were　selected.　Finally,　the　differences　in　driving　behaviors　under　different　modes　were　examined.　The　results　indicated　that　drivers　performed　better　when　using　only　the　navigation　system　and　the　combination　mode,　based　on　the　driving　behaviors　of　the　entire　section.　The　vehicle　operation　efficiency　under　the　three　modes　was　consistent　in　the　three　subsections;　however,　the　driving　safety　performance　varied　with　the　changes　in　the　subsections.