The deterministic-stochastic flow model
  A discrete model of traffic on a multilane road is considered. The traffic is presented as particles movement with a deterministic component and a stochastic one. Formulas for the traffic characteristics have been found. The model can explain theoretically some phenomena that have been discovered earlier on the basis of the experimental results. 
A. P. Buslaev, V. M. Prikhodko, A. G. Tatashev, M. V.Yashina (The   Moscow State Automobile & Road Technical University)