Coating type of the roads inside the tunnel is very important for ensuring fire safety. Asphalt coatings are made up of bitumen, which is an organic matter, and of inorganic matters such as sand and gravel. Therefore asphalt coatings are flammable and are not resistant to very high temperatures. When the asphalt burns, it emits toxic gas. However, concrete, which is made up of inorganic matters such as cement, water, sand and gravel, is inorganic and is not flammable. It is very resistant to high temperatures and does not cause toxic gas emission during the fires. For this reason, it provides an environment favorable for the people to evacuate the scene and for the rescue teams and fire brigade to respond.