No, you cannot have multiple currents flowing in different directions in the same wire because all real wires have resistance. It will lead to inconsistencies with respect to other considerations, such as power dissipation.1 Oct 2020
Does current always flow in one direction?
Direct current is produced when electrons flow constantly in one direction. Since direct current flows in one direction only, its electrical pressure or voltage is always oriented in one direction, or "polarity".
Can current flow in opposite directions?
If only negative charges are moving (like in a metal wire for example) the current arrow still points in the direction positive charges would move IF there was positive charge present. Whenever you see a current arrow, you can be assured that electrons are flowing in the opposite direction.