To dream that you are on a freeway indicates that you are feeling liberated and free. You are well on your way to achieving your goals. If the freeway is slow moving or blocked, then it suggests frustrations or obstacles that are hindering your path toward your goals.
To dream that the freeway is under construction or is being reconstructed implies that you are experiencing a setback toward accomplishing your goals. Perhaps you need to rethink your approach in some task.