A vehicle length sensor for a vehicle such as a variable length truck, the sensor being provided with a mount for mounting the sensor on a vehicle and being arranged with a detection circuit arranged to measure, in use, a length of a vehicle to which the sensor is mounted. Typically, the detection c
A vehicle length sensor for a vehicle such as a variable length truck, the sensor being provided with a mount for mounting the sensor on a vehicle and being arranged with a detection circuit arranged to measure, in use, a length of a vehicle to which the sensor is mounted. Typically, the detection circuit comprises a transmitter circuit, which is arranged to transmit radiation along the length of the vehicle, and a receiver circuit that is arranged to receive radiation that was transmitted by the transmitter circuit and reflected from the vehicle, and in which the detection circuit is arranged to determine from the reflected radiation the length of the vehicle. The sensor may also act as a lane change assistant, comparing the range of other vehicles to the length of the vehicle to which it is mounted.
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1. A vehicle length sensor for a vehicle having a length, the sensor comprising a mount for mounting the sensor on the vehicle and a detection circuit arranged to measure, in use, the length of the vehicle to which the sensor is mounted, wherein the length is the length of the entire vehicle, includ
1. A vehicle length sensor for a vehicle having a length, the sensor comprising a mount for mounting the sensor on the vehicle and a detection circuit arranged to measure, in use, the length of the vehicle to which the sensor is mounted, wherein the length is the length of the entire vehicle, including any trailer, or at least the length from where the sensor is mounted on the vehicle, including any trailer, to a rear end or a front end thereof, wherein the sensor is arranged to detect any other vehicles which are, in use of the sensor, alongside the vehicle to which the sensor is mounted, wherein the sensor is arranged to determine the distance of the other vehicles alongside the vehicle from the vehicle in a direction parallel to a direction of travel of the vehicle, and wherein the sensor is arranged to provide an indication to a driver of the vehicle, in use, of whether there are any vehicles alongside the vehicle for a distance of the length of the vehicle, plus an optional safety margin. 2. The sensor of claim 1, wherein the detection circuit comprises a transmitter circuit, which is arranged to transmit radiation along the length of the vehicle, and a receiver circuit that is arranged to receive reflected radiation that was transmitted by the transmitter circuit and reflected from the vehicle, and in which the detection circuit is arranged to determine from the reflected radiation the length of the vehicle. 3. The sensor of claim 2, wherein the detection circuit is arranged to determine a speed at which a target reflecting the transmitted radiation back to the receiver circuit is moving. 4. The sensor of claim 3, wherein the sensor comprises an input for a vehicle speed signal indicative of a speed of the vehicle; the detection circuit being arranged to determine that only reflections from targets that are moving at the same speed as the vehicle are echoes from the vehicle. 5. The sensor of claim 1, wherein the detection circuit is arranged to detect the reflection of a reflective target having predetermined reflective qualities. 6. The sensor of claim 1, arranged to periodically update the measurement of the vehicle's length, in which the sensor is provided with an input for an indication of whether the vehicle is turning, with the sensor being arranged to perform the measurement of the length at a higher rate when the vehicle is turning than when it is not. 7. The sensor of claim 1, wherein the mount is arranged such that the sensor could be, at least partially, mounted on the side of a vehicle. 8. The sensor of claim 7, wherein the mount is arranged so as to be at least partially mounted in or on an external rear view mirror housing of the vehicle. 9. A vehicle provided with a vehicle length sensor, the vehicle having a length, the sensor comprising a mount mounting the sensor on the vehicle and a detection circuit arranged to measure, in use, the length of the vehicle, wherein the length is the length of the entire vehicle, including any trailer, or at least the length from where the sensor is mounted on the vehicle, including any trailer, to a rear end or a front end thereof, wherein the sensor is arranged to detect any other vehicles which are, in use of the sensor, alongside the vehicle to which the sensor is mounted, wherein the sensor is arranged to determine the distance of the other vehicles alongside the vehicle from the vehicle in a direction parallel to a direction of travel of the vehicle, and wherein the sensor is arranged to provide an indication to a driver of the vehicle, in use, of whether there are any vehicles alongside the vehicle for a distance of the length of the vehicle, plus an optional safety margin. 10. The vehicle of claim 9, wherein the sensor is mounted at least partially in or on a rear view mirror housing of the vehicle. 11. The vehicle of claim 9, wherein the vehicle is provided with at least one further sensor comprising a mount mounting the further sensor on the vehicle and a detection circuit arranged to measure, in use, the length of the vehicle, provided on an opposing side of the vehicle to the sensor.
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