Composition for surfacing lightly trafficked thoroughfares, allowing plant growth to be limited or even completely suppressed

A draining composition for light-traffic road pavement intended to cover a ground, comprising:

• (a) a first granular layer, referred to as a draining layer, having a percentage of communicating voids ranging from 25% to 50%, and which comprises at least one binder and a granular mixture of which at least 80% by weight, with respect to the total weight of the granular mixture, has a granular size distribution ranging from 4 to 20 mm, said first granular layer having a layer thickness suitable for or configured so as to ensure the mechanical strength of the light-traffic road pavement;
• (b) a second granular layer, referred to as a free layer, having a main lower surface and a main upper surface, said main lower surface resting directly on said first granular layer and said main upper surface being in direct contact with the air, said second granular layer being composed of a granular mixture that is not bound by a binder and of which at least 80% by weight, in relation to the total weight of the granular mixture, has a granular size distribution ranging from 2 to 14 mm, said second granular layer having a layer thickness suitable for or configured so as not to cause water accumulation,
• the granular mixture of the second granular layer having a granular size distribution which is less than that of the granular mixture of the first granular layer.