In the other verses when the Tabernacle (was raised up tent of the testimony)there was the cloud that covered it. This cloud was the sign of God's ever presence. It became a pillar of fire at night. This cloud became a sign that if it remained over the tabernacle they would stay where they were, but if the cloud was taken up they would start on a journey. The timing of the journey was up to God.
The lesson I see for myself is that like God determined their movements so He can determine mine and yours. My question is do we move by ourselves or by God's determination?