Schematic of the antiparallel two-lane TASEP with Langmuir kinetics and lane switching. Two lanes (green and blue) have their plus ends (indicating the direction of motor motion) oppositely oriented. The blue lane (R) has plus end to the right; the green lane (L) has plus end to the left. Motors (red) bind to empty lattice sites with rate konc, where c is the bulk motor concentration, and unbind with rate koff. Bound motors step toward the lane plus end with rate v (if the adjacent site toward the plus end is empty) or switch to the other lane with rate s (if the corresponding site on the adjacent lane is empty). At minus ends, motors are inserted at rate αR,Lv. At plus ends, motors are removed at rate βR,Lv.