Optimize Your Citizens
Civil engineering is very important. In particular, the development of roads, freeways, and anything related to how the populace gets from point A to point B.
With poor civil engineering, it creates traffic jams, inefficient routes, and increases probability of vehicle collisions.
When the people you are responsible for are forced to suffer longer transportation times due to poor design, you are doing them a disservice.
Civil engineering is analogous to building good development tools for your software engineers. Save all your developers 1 minute of debugging code each day and you increase overall productivity. In the same sense, if you save all your citizens 1 hour of transportation time each day, think of how much more can be done with their time.
Design everything you do to optimize output and quality.