  This contribution presents a derivation of the steady-state distribution of
velocities and distances of vehicles in freeway traffic which has been
suggested for the evaluation of interaction potentials among vehicles (see
preprint cond-mat/0301484). Despite the forwardly directed interactions and the
additional driving terms in vehicle traffic, the steady-state velocity and
distance distributions agree with the equilibrium distributions of classical
many-particle systems with symmetrical interactions, if the system is large
enough. Finally, this analytical result is confirmed by computer simulations.
