A free program for Android, by Game Suburb.

Mega City Road Construction 3D is a real construction simulator with a unique gameplay and a great game environment. You will experience a variety of challenges as you construct roads and bridges in this city. The goal of this game is to build the best road possible while keeping the cost as low as possible. There are a variety of materials that you can use to build your roads and bridges. These include dirt, gravel, bricks, and concrete. 

There are a variety of vehicles that you can drive to help you build your roads. You can choose between a crane, excavator, dumper truck, and a bulldozer. The vehicles have different roles in this game. The excavator is used to dig the dirt and build the road. The dumper truck is used to carry the dirt and concrete to the building site. The crane is used to lift and move the materials. The bulldozer is used to clean the building site.

Mega City Road Construction 3D is a free game. You can download it from Google Play.