This is a completed toy designed for children.
From the Lego website:
Get to work with this exciting, two-vehicle LEGO® Technic Roadwork Crew set, featuring a truck with working steering, tipping flatbed and a removable trailer, plus a tracked digger with rotating superstructure and working boom and bucket. This detailed 2-in-1 set comes with a classic orange, gray and black color scheme and can be rebuilt to create a Mini Gritter with Plow, providing a double build-and-play experience! Both models can be built by following the free interactive, 3D digital LEGO Building Instructions app.