  A nanoelectronic device made of twisted bilayer graphene (TBLG) is proposed
to steer the direction of the current flow. The ballistic electron current,
injected at one edge of the bottom layer, can be guided predominantly to one of
the lateral edges of the top layer. The current is steered to the opposite
lateral edge, if either the twist angle is reversed or the electrons are
injected in the valence band instead of the conduction band, making it possible
to control the current flow by electric gates. When both graphene layers are
aligned, the current passes straight through the system without changing its
initial direction. The observed steering angle exceeds well the twist angle and
emerges for a broad range of experimentally accessible parameters. It is
explained by the trigonal shape of the energy bands beyond the van Hove
singularity due to the Moir\'e interference pattern. As the shape of the energy
bands depends on the valley degree of freedom, the steered current is partially
valley polarized. Our findings show how to control and manipulate the current
flow in TBLG. Technologically, they are of relevance for applications in
twistronics and valleytronics.
