A process for the preparation of bitumen foam, wherein a gas is dispersed into the bitumen with a temperature of less than 200° C. and with a viscosity from 100-10,000 mPas measured at the temperature using EN 12596, wherein the process includes bringing the gas tangentially into contact with a bitumen stream, to obtain a bitumen foam that is not dehydrogenated, oxidised or otherwise chemically modified, and in which at least 10 vol % gas is distributed substantially homogeneously. This process can be applied simply and safely, and results in bitumen foam without additions being necessary for this. In this way bitumen can be processed at lower temperatures, even below 100° C., to asphalt or wearing course. The foam bitumen thereby has a half-life time that is much longer than the one of existing bitumen foams