A road surface has fixed thereon a salt which lowers the freezing point of water by means of an aqueous fixation composition which comprises a mixture of an adhesion-promoting agent formed by an aqueous dispersion of a film-forming polymer or copolymer and a water-soluble hydrophobic agent which, in air, becomes insoluble in water. The proportion by weight of hydrophobic agent relatively to the dry extract of the adhesion-promoting agent is from 5 to 25%. The fixation composition is used in a proportion such that all the adhesion-promoting agent and the hydrophobic agent represents, in dry weight, from 10 to 120% of the weight of the salt. The aqueous fixation composition may in addition possibly comprise a foam-inhibiting agent and/or a second hydrophobic agent.
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