2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153235Traffic jam in an optimal velocity model with the backward reference function is analyzed. An analytic scaling solution is presented near the critical point of the phase separation. The validity of the solution has been confirmed from the comparison with the simulation of the model.11 pages, 2 ps figures, RevTeXPattern Formation and Solitonstext