  We investigate traffic flows using the kinetic Boltzmann equations with a
Maxwell collision integral. This approach allows analytical determination of
the transient behavior and the size distributions. The relaxation of the car
and cluster velocity distributions towards steady state is characterized by a
wide range of velocity dependent relaxation scales, $R^{1/2}<\tau(v)<R$, with
$R$ the ratio of the passing and the collision rates. Furthermore, these
relaxation time scales decrease with the velocity, with the smallest scale
corresponding to the decay of the overall density. The steady state cluster
size distribution follows an unusual scaling form $P_m \sim < m>^{-4} \Psi(m/<
m>^2)$. This distribution is primarily algebraic, $P_m\sim m^{-3/2}$, for $m\ll
< m>^2$, and is exponential otherwise.
