I think it would be a good idea to explore more the potentials of drones in the road sector. I recommend you reading the report prepared by the World Road Association "The use of Unmanned Aerial Systems to remotely collect data for road infrastructure" it can give you a perspective for your research. Good luck.
I am sure that in 10-20 years drones will complete almost half of the work in the construction sector, therefore this research topic is high-tech and relevant.