速度制限標識は何を意味しますか?What does 'speed limit' mean?
道路条件が良好な場合の最低時速The recommended speed for that road
道路条件が良好な場合の最高時速The fastest speed for that road in good conditions
推奨時速The minimum speed for that road in good conditions
最高時速制限、ただし追い越し時にはこの制限を超えてもよいThe fastest speed except for when you are overtaking another vehicle