Road construction is a process of building new roads or repairing existing ones. When it comes to synonyms for this phrase, there are several options available. One of the most common synonyms is "roadwork", which refers to any type of work done on a road, including construction, repairs, and maintenance. Another similar phrase is "road improvement", which specifically refers to making changes to a road to make it safer or more efficient. "Highway construction" is another synonym that is often used to describe major road building projects, while "pavement construction" refers specifically to the laying down of a road's surface. Overall, there are many words and phrases that can be used to describe the process of building and maintaining roads.