Device for managing automobile vehicle parking on a road, comprising: - means for detecting with ultrahigh frequency electromagnetic waves in order to detect the presence of an automobile vehicle on a specific parking place, and - at least one unit, receiving information about the presence and absence of a vehicle on said place, this information resulting from the detection performed by the detection means, the unit being configured to manage said information and/or to transmit it to a management device, characterised in that the detection means comprise at least one ultrahigh frequency senor disposed at the level of at least one specific place able to receive a vehicle and being disposed on the ground, or in the ground, or even at a height not exceeding 1.50 m from the ground, and in particular 1 m from the ground, the sensor being configured to emit and to receive an ultrahigh frequency beam in the direction of the position of a vehicle on said specific place, so that detection in said beam causes dispatch of information about the presence to said unit, said sensor comprising one, two, three or four ultrahigh frequency radar systems (2, 3, 5, 7), each orientated specifically towards a specific place which is allocated to it, and sensitive to the presence and to the absence of a vehicle on its specific place, each radar system being sensitive to the power of the single reflection by the obstacle formed by the presence of the vehicle on its place, each radar system comprising: - a first antenna orientated towards the specific place, in a direction of the position of a vehicle on this place, so that the major part of the sent radio power is concentrated about a single axis, - an oscillator able to generate a wave of a first ultrahigh frequency and to transmit it to the first antenna, - another oscillator able to generate a wave of a second ultrahigh frequency f2 which is slightly different from the first frequency f1, - a receiving antenna sensitive to the echo of the radio emission of the first antenna, the radar system being hence almost solely sensitive to the powers received about said axis, - a mixer, one of the inputs of which is supplied by the receiving antenna, and the other input of the mixer being supplied by said other oscillator at the second frequency f2, the output of the mixer being connected to a logarithmic amplifier, the presence of the vehicle being determined by the output signal of the mixer, which has then a frequency f1 - f2 equal to the difference of the frequencies f1 and f2, the output of the amplifier then having a characteristic voltage, said sensor being contained or embedded in a sealed casing, able to be interred in the ground, or placed in a border, or a terminal, or housed in an item of street furniture, the device comprising a transmission means which is able to communicate to said unit information relating to the presence or to the absence of a vehicle on each place. - means for detecting with ultrahigh frequency electromagnetic waves in order to detect the presence of an automobile vehicle on a specific parking place, and - at least one unit, receiving information about the presence and absence of a vehicle on said place, this information resulting from the detection performed by the detection means, the unit being configured to manage said information and/or to transmit it to a management device, - a first antenna orientated towards the specific place, in a direction of the position of a vehicle on this place, so that the major part of the sent radio power is concentrated about a single axis, - an oscillator able to generate a wave of a first ultrahigh frequency and to transmit it to the first antenna, - another oscillator able to generate a wave of a second ultrahigh frequency f2 which is slightly different from the first frequency f1, - a receiving antenna sensitive to the echo of the radio emission of the first antenna, the radar system being hence almost solely sensitive to the powers received about said axis, - a mixer, one of the inputs of which is supplied by the receiving antenna, and the other input of the mixer being supplied by said other oscillator at the second frequency f2, the output of the mixer being connected to a logarithmic amplifier,