Rail crossing device designed for crossing a first rail system embedded in a road surface with a second rail system embedded in the road surface, said device comprising: - a first rail system designed for moving or guiding a vehicle or any other movable device and comprising: • at least one first rail having a rail head, the upper surface of which is substantially flush with the road surface, a first side surface and a second side surface opposite the first; and • at least one spacing means designed for defining a passage space for raised structures of rolling or guiding means at least on the side of the first side surface of the rail head; - a second rail system designed for guiding a vehicle and comprising at least one guide rail, said guide rail: • having a rail head, an upper surface of which is substantially flush with the road surface, and crossing the first rail; • having a break in the region of the crossing with the first rail in order to form two segments (26, 27), respectively having a first end and a second end in alignment with the first end; - at least one extensible portion integrated into at least the first segment or the second segment (26, 27); - at least one manoeuvring means designed for extending and contracting the extensible portion in a lengthwise direction, defining a contracted position in which the first end is moved away from the first rail in order to allow a vehicle or any other movable device to travel along this first rail; and an extended position in which the first end is moved towards the first rail in order to guide a vehicle along the guide rail. - a first rail system designed for moving or guiding a vehicle or any other movable device and comprising: • at least one first rail having a rail head, the upper surface of which is substantially flush with the road surface, a first side surface and a second side surface opposite the first; and • at least one spacing means designed for defining a passage space for raised structures of rolling or guiding means at least on the side of the first side surface of the rail head; • at least one first rail having a rail head, the upper surface of which is substantially flush with the road surface, a first side surface and a second side surface opposite the first; and • at least one spacing means designed for defining a passage space for raised structures of rolling or guiding means at least on the side of the first side surface of the rail head; - a second rail system designed for guiding a vehicle and comprising at least one guide rail, said guide rail: • having a rail head, an upper surface of which is substantially flush with the road surface, and crossing the first rail; • having a break in the region of the crossing with the first rail in order to form two segments (26, 27), respectively having a first end and a second end in alignment with the first end; • having a rail head, an upper surface of which is substantially flush with the road surface, and crossing the first rail; • having a break in the region of the crossing with the first rail in order to form two segments (26, 27), respectively having a first end and a second end in alignment with the first end; - at least one extensible portion integrated into at least the first segment or the second segment (26, 27); - at least one manoeuvring means designed for extending and contracting the extensible portion in a lengthwise direction, defining a contracted position in which the first end is moved away from the first rail in order to allow a vehicle or any other movable device to travel along this first rail; and an extended position in which the first end is moved towards the first rail in order to guide a vehicle along the guide rail.