  We present a two channel driven lattice gas model with oppositely directed
species moving on two parallel lanes with lane switching processes. We study
correlated lane switching mechanism for particles so that switching may occur
with finite probability only when oppositely directed species meet on the same
channel. The system is analyzed for closed ring with conserved total particle
number. For asymmetric particle exchange between the lanes, the system exhibits
unique polarization phenomenon with segregation of oppositely directed species
between the two lanes. The polarization phenomenon can be understood as a
consequence of existence of an absorbing steady state. For symmetric exchange
rate of particles between the lanes, the system remains unpolarized, with equal
particle density on both the lanes in the thermodynamic limit of large system
size. We study the system using a combination of a Mean Field(MF) analysis and
Monte Carlo simulations. The nature of phase segregation that we see for this
system, is distinct from driven particle systems which are in contact with
particle reservoir. The features observed for this minimal model will have
ramifications for biofilament based intracellular transport, wherein cellular
cargo, e.g; organelles and vesicles are transported by oppositely directed
particles on multiple filament tracks.
