A production system for producing modified bitumen by mixing bitumen with at least one additive, characterized by comprising; - a raw material source wherein bitumen is stored; - an additive source wherein an additive is stored; - at least one production tank into which the bitumen received from the raw material source and the additive received from the additive source are transferred; - at least one mixer mixing the bitumen and the additive in the production tank with each other; - at least one homogenizer receiving the bitumen-additive mixture in the production tank through the lower part of the production tank and supplying same back to the production tank through the upper part of the production tank via at least one return line so as to provide a homogenous mixture of the bitumen and the additive - at least one gas source supplying an inert gas into the production tank in order to remove undesired gases in the production tank and/or to supply an oxygen-intensive gas; - at least one gas sensor analyzing the gases generated in the production tank so as to detect hazardous gases; - at least one combustion unit connected to at least one combustible gas source and said production tank; - at least one combustion valve controlling gas passage from the production tank to the combustion unit; - at least one temperature regulation unit controlling the temperature of the production tank and - at least one control unit configured to control operation of the production system, to control said at least one combustion valve controlling gas passage from the said production tank to the said combustion unit and to activate the said combustion unit to start combusting the gases generated in the production tank via the combustible gas received from the combustible gas source if hazardous gas detected by said gas sensor exceeds 2 ppm. - a raw material source wherein bitumen is stored; - an additive source wherein an additive is stored; - at least one production tank into which the bitumen received from the raw material source and the additive received from the additive source are transferred; - at least one mixer mixing the bitumen and the additive in the production tank with each other; - at least one homogenizer receiving the bitumen-additive mixture in the production tank through the lower part of the production tank and supplying same back to the production tank through the upper part of the production tank via at least one return line so as to provide a homogenous mixture of the bitumen and the additive - at least one gas source supplying an inert gas into the production tank in order to remove undesired gases in the production tank and/or to supply an oxygen-intensive gas; - at least one gas sensor analyzing the gases generated in the production tank so as to detect hazardous gases; - at least one combustion unit connected to at least one combustible gas source and said production tank; - at least one combustion valve controlling gas passage from the production tank to the combustion unit; - at least one temperature regulation unit controlling the temperature of the production tank and - at least one control unit configured to control operation of the production system, to control said at least one combustion valve controlling gas passage from the said production tank to the said combustion unit and to activate the said combustion unit to start combusting the gases generated in the production tank via the combustible gas received from the combustible gas source if hazardous gas detected by said gas sensor exceeds 2 ppm.