Method for planning a journey, comprising the following steps: - determining, from a piece of computer equipment of a user, a start point of the journey and an end point of said journey, - selecting at least two vehicles (CAR, VEL, MET) as means of transport between the start point and the end point, such that the journey comprises at least a first journey segment (A-X1) using one vehicle and a second journey segment (Y2-B) using another vehicle, the method comprising the following steps: - using a fleet of shared vehicles, said vehicles being equipped with a locking/unlocking device that, when they are activated by a piece of equipment (CEQ, VEQ) of said vehicles, make said vehicles physically unusable, - assigning, by means of a server (SERV), statuses to the vehicles of the fleet, which statuses are at least: "available for reservation" and "unavailable for reservation", - determining, by means of the server (SERV), geographic positions of the vehicles of the fleet, - as soon as the start point and end point of the journey are known to the server (SERV) then: selecting, by means of said server, at least one fleet vehicle (CAR, VEL) that is located between the start point and the end point and that has the status "available for reservation", - generating, by means of the server (SERV), the fastest and/or shortest journey between the start point and the end point, said journey being generated such that at least one of the journey segments (A-Xl; Y2-B) uses the selected vehicle (CAR, VEL), - transmitting this journey, from the server (SERV), to the piece of computer equipment of the user for validation, - in case of validation of the journey of the user: -- reserving, from the server (SERV), the selected vehicle (CAR, VEL), the status of said vehicle passing from "available for reservation" to "unavailable for reservation", -- transmitting, by means of the server (SERV), a command to activate the locking/unlocking device of the reserved selected vehicle (CAR, VEL), and wherein a command to deactivate the locking/unlocking device of the reserved selected vehicle (CAR, VEL) is transmitted by the server (SERV) to the piece of equipment (CEQ, VEQ) of said vehicle, when said server detects, via geolocation, that the position of the piece of equipment of the user coincides with the position of said vehicle. - determining, from a piece of computer equipment of a user, a start point of the journey and an end point of said journey, - selecting at least two vehicles (CAR, VEL, MET) as means of transport between the start point and the end point, such that the journey comprises at least a first journey segment (A-X1) using one vehicle and a second journey segment (Y2-B) using another vehicle, - using a fleet of shared vehicles, said vehicles being equipped with a locking/unlocking device that, when they are activated by a piece of equipment (CEQ, VEQ) of said vehicles, make said vehicles physically unusable, - assigning, by means of a server (SERV), statuses to the vehicles of the fleet, which statuses are at least: "available for reservation" and "unavailable for reservation", - determining, by means of the server (SERV), geographic positions of the vehicles of the fleet, - as soon as the start point and end point of the journey are known to the server (SERV) then: selecting, by means of said server, at least one fleet vehicle (CAR, VEL) that is located between the start point and the end point and that has the status "available for reservation", - generating, by means of the server (SERV), the fastest and/or shortest journey between the start point and the end point, said journey being generated such that at least one of the journey segments (A-Xl; Y2-B) uses the selected vehicle (CAR, VEL), - transmitting this journey, from the server (SERV), to the piece of computer equipment of the user for validation, - in case of validation of the journey of the user: -- reserving, from the server (SERV), the selected vehicle (CAR, VEL), the status of said vehicle passing from "available for reservation" to "unavailable for reservation", -- transmitting, by means of the server (SERV), a command to activate the locking/unlocking device of the reserved selected vehicle (CAR, VEL), -- reserving, from the server (SERV), the selected vehicle (CAR, VEL), the status of said vehicle passing from "available for reservation" to "unavailable for reservation", -- transmitting, by means of the server (SERV), a command to activate the locking/unlocking device of the reserved selected vehicle (CAR, VEL),