Some AS/RSs (called steering) are also able to negotiate curves on their route.
Fixed conveyors These are material-handling systems that remain fixed while the load units move. The movement of the load units takes place by means of motorized mechanisms that drive the load ahead by friction. Roller conveyors (see Figure 5.11a) and wheel conveyors (see Figure 5.11b) both belong to this family of material-handling systems.