Using cellular automata model, we numerically study the traffic characteristics and the probability P ac of car accidents to occur at the intersection of two roads under open boundary conditions. However, the existence of multi-SLZ in the road decreases the risk of collision in the congestion phase. In contrast with the homogeneous case, it is found that in the low densities the probability Pac without SLZ (n = 0) is low than Pac with multi-SLZ (n > 0). Furthermore, the impact of multi-SLZ on the probability Pac is also studied. In the nondeterministic case, SLZ decreases the effect of braking probability P b in the low densities. In the deterministic case, SLZ leads to the appearance of car accidents even in the low densities, in this region Pac increases with increasing of fraction of fast vehicles (F f). SLZ in the heterogeneous traffic has an important effect, typically in the mixture velocities case. Using the extended Nagel-Schreckenberg (NS) model, we numerically study the impact of the heterogeneity of traffic with speed limit zone (SLZ) on the probability of occurrence of car accidents (Pac).
