The road builder has to either eat the dirt or wear a mask if the weather is dry. If we are called to build the road but instead decide we are going to travel the road for Christ we are accountable for not doing what God originally called us to do. We can tell everyone here on Earth we are traveling God's road and get the glory here and now. However, when we see Jesus face to face we will have to explain. We will need to explain why we did not help build the road.
Road building is humble work.
We will need to explain why we chose to not do the dirty work. We will need to explain why, perhaps, we wanted more of the more glorious work of traveling rather than building. And when the Israelites saw the great power the LORD displayed against the Egyptians, the people feared the LORD and put their trust in him and in Moses his servant. Christ wants all of us to do His will because He loves us and because we have accepted Him into our lives. He hopes that we trust and believe in Him because He was willing to die for us.