Method for predicting a value representative of a quality of connection of a vehicle to a cellular network from a target location on a road network, the method comprising: - a phase of training a prediction model comprising the following steps: ∘ receiving, from at least one training vehicle connected to a particular access point, a location datum of the training vehicle, an identifier of the access point to which the training vehicle is connected, and a value representative of a quality of the connection of the training vehicle to said access point, ∘ determining (202, 203, 204) a characteristic of propagation of a radio signal between the received location and the identified access point, comprising at least one length of a rectilinear propagation path of the signal from the identified access point to the received location, the signal being transmitted through a first topographic element, and at least one characteristic of the first topographic element, ∘ training the prediction model on the basis of the determined characteristic of propagation associated with the value representative of a quality of the received connection; and - a phase of predicting a second value representative of a quality of connection to a cellular network at the target location on a road network, comprising the following steps: ∘ identifying a target cellular access point accessible from the target location, ∘ determining (209, 210, 211) a second characteristic of propagation of a radio signal between the target location and the identified target access point, comprising at least one length of a rectilinear propagation path of the signal from the identified access point to the target location, the signal being transmitted through a first topographic element, and at least one characteristic of the first topographic element, ∘ predicting a value representative of a quality of connection to the target cellular access point from the target location by applying the model to the second characteristic of propagation. - a phase of training a prediction model comprising the following steps: ∘ receiving, from at least one training vehicle connected to a particular access point, a location datum of the training vehicle, an identifier of the access point to which the training vehicle is connected, and a value representative of a quality of the connection of the training vehicle to said access point, ∘ determining (202, 203, 204) a characteristic of propagation of a radio signal between the received location and the identified access point, comprising at least one length of a rectilinear propagation path of the signal from the identified access point to the received location, the signal being transmitted through a first topographic element, and at least one characteristic of the first topographic element, ∘ training the prediction model on the basis of the determined characteristic of propagation associated with the value representative of a quality of the received connection; and ∘ receiving, from at least one training vehicle connected to a particular access point, a location datum of the training vehicle, an identifier of the access point to which the training vehicle is connected, and a value representative of a quality of the connection of the training vehicle to said access point, ∘ determining (202, 203, 204) a characteristic of propagation of a radio signal between the received location and the identified access point, comprising at least one length of a rectilinear propagation path of the signal from the identified access point to the received location, the signal being transmitted through a first topographic element, and at least one characteristic of the first topographic element, ∘ training the prediction model on the basis of the determined characteristic of propagation associated with the value representative of a quality of the received connection; and - a phase of predicting a second value representative of a quality of connection to a cellular network at the target location on a road network, comprising the following steps: ∘ identifying a target cellular access point accessible from the target location, ∘ determining (209, 210, 211) a second characteristic of propagation of a radio signal between the target location and the identified target access point, comprising at least one length of a rectilinear propagation path of the signal from the identified access point to the target location, the signal being transmitted through a first topographic element, and at least one characteristic of the first topographic element, ∘ predicting a value representative of a quality of connection to the target cellular access point from the target location by applying the model to the second characteristic of propagation. ∘ identifying a target cellular access point accessible from the target location, ∘ determining (209, 210, 211) a second characteristic of propagation of a radio signal between the target location and the identified target access point, comprising at least one length of a rectilinear propagation path of the signal from the identified access point to the target location, the signal being transmitted through a first topographic element, and at least one characteristic of the first topographic element, ∘ predicting a value representative of a quality of connection to the target cellular access point from the target location by applying the model to the second characteristic of propagation.