In regions that are difficult to overcome geographically in road transport, tunnels both shorten the road to be covered and save fuel. It is the worst scenario that a vehicle can burn in a tunnel. There have been major tunnel fires in the world that have resulted in people's lives. In our country, long highway tunnels such as the Ovit, Kop and Zigana tunnels are being built. In this study, emergency modeling was carried out for vehicle fire (30 MW) in a long road tunnel (14.5 km). The critical point for the emergency was determined and the 1000 m long region was examined on a scale of 1/100. Ansys Fluent was used in the study. Turbulent flow conditions are taken into account. Temperature distribution, carbon monoxide (CO) emission distribution and velocity distributions in the region where the fire is located were examined. Results are given in graphs and interpreted. When the temperature values are examined, the average temperature values in the fire zone were obtained above 400 K in the first 30 m. It was obtained that the CO values did not fall below 400 ppm until the firing shaft, especially in the first 50 m, above 1000 ppm on average.