Road construction is a temporary blockage of a road for the sake of improvement in the future. Its significance would be the same in a dream. It would indicate that someone or some event in real life has created a temporary block to the dreamer’s real life plans.
The dream may or may not have indicated a way out. If the dreamer woke up upon arriving at or seeing the road construction in the dream, then the dream did not seem to have provided a solution. If one circumnavigated the obstruction of the road construction in the dream, then the dream has provided a solution to the temporary blockage. This dream then would advise bypassing the obstacle in real life by finding a way around the problem.