A transit mixer, also known as a concrete mixer truck, is a specialized vehicle used to transport freshly mixed concrete from the batching plant to the construction site. It consists of a cylindrical drum mounted on the truck chassis, which rotates during transportation to keep the concrete mixture in a homogeneous state.

The drum is typically made of steel and is equipped with blades or fins that help mix the concrete as it rotates. Transit mixers come in various sizes, with capacities ranging from a few cubic meters to several cubic meters, depending on the requirements of the project. They are essential for delivering concrete efficiently and ensuring that it remains workable until it is poured at the construction site. Transit mixers play a crucial role in the construction industry by enabling the timely and reliable transportation of concrete to where it is needed for various construction activities.