  We present a Monte Carlo study of the high-temperature phase of the
two-dimensional driven lattice gas at infinite driving field. We define a
finite-volume correlation length, verify that this definition has a good
infinite-volume limit independent of the lattice geometry, and study its
finite-size-scaling behavior. The results for the correlation length are in
good agreement with the predictions based on the field theory proposed by
Janssen, Schmittmann, Leung, and Cardy. The theoretical predictions for the
susceptibility and the magnetization are also well verified. We show that the
transverse Binder parameter vanishes at the critical point in all dimensions
$d\ge 2$ and discuss how such result should be expected in the theory of
Janssen et al. in spite of the existence of a dangerously irrelevant operator.
Our results confirm the Gaussian nature of the transverse excitations.
