I am picking up the story of Peter walking on water. If your husband’s eyes are not on Jesus, the two of you are in trouble. The road is the path that Jesus is asking him to take as he leads your fanily. I like that you are allowing Him to lead by driving the car but you need to pray and trust God to lead Him. Pray for him. The water could be good or bad, when the enemy comes in like a flood the Lord raises up a standard, could be one interpretation of the water. The other is that the Word of God is also referred to as water in the Bible.
Read Isaiah 59:19, Ephesians 5:25-26