Works police radar

Speed ​​measurement - the measurement methods and their reliability


From, last updated on: April 15, 2021

Speed ​​measurement with radar, laser and pistol

Pistols, lasers, following cars - not an action film, but everyday life on German streets. Every day the police go on the hunt for traffic offenderswho do not adhere to the given speed limit.

Exceeding the speed limit is one of the administrative offenses that is most frequently sanctioned. The measurement methods on which the respective fine notification is based are diverse. In addition to the stationary measurement, i.e. permanently installed speed cameras, there are mobile speed measurement with the laser or the laser gun. also the police can follow the vehicle in question and measure its speed from your car. Video tracking systems are used here.

No matter what method traffic offenders are caught, it is helpful to familiarize yourself with the technique of measuring speed. Because this knowledge can prove useful in administrative offense proceedings, in order to successfully take action against an incorrect fine notice and avert points or even a driving ban. Because if the police want to determine the speed legally, they have to consider a few points.

FAQ: speed measurement

How can the speed of cars be measured?

Various devices are used for this: In addition to fixed speed traps, police officers can also set up mobile speed cameras that work with lasers.

I was flashed, but I am sure that I drove according to the regulations. What can I do?

It is entirely possible that the measurement result is incorrect. In this case, you can appeal against the fine. A lawyer can assist you with this, but it is only worthwhile if the legal support is not more expensive than the fine.

Can I prevent a speed measurement with jamming devices?

No, the use of such laser jammers is prohibited.

Special information on speed measurement

  • A wide variety of measuring devices are used in the context of speed measurement. A standardized measuring method is based on the coaxial cable measurement. You can read here how exactly it works and which sources of error are conceivable during the measurement. " Continue reading...

  • There are many techniques that the police can use during speed control. One such possibility would be to measure the speed with a laser. Find out here how these speed cameras work, how reliable they are and which models are available! " Continue reading...

  • If you live directly on a street where drivers are often traveling far too fast, you may be thinking of taking a private speed measurement. But is it really possible for you to hire a private company to monitor the traffic on your street? Or can you apply for an official speed measurement? " Continue reading...

The classic: measure the speed of a car with a speed trap

Something outdated is to monitor the speed using fixed speed traps. This measuring device emits electromagnetic waves that are reflected by the car and reflected back to the sensor when a vehicle comes into this radar beam. The frequency of the beam changes. The speed of the vehicle can be determined on the basis of this change. The moment the speed trap measures a speed, the above the previously defined tolerance range the passing car is photographed, so flashed.

These devices for measuring speed exist

Traffic radar systemsMultanova 6F Digital, TRAFFIPAX Speedophot, TRAFFIPAX Micro-Speed ​​09, TRAFFIPAX Speedoguard, M5 Radar, Mesta 208, radar traps
Light barrier measuring devicesESO µP80, ESO ES 1.0, ESO ES 3.0
Video tracking systemsProvida Vidista, Provida 2000, CG P50e (video stopwatch), VKS 3.0, Police-Pilot, VIDIT VKS 3.01
Speed ​​measuring devices with induction loopsTruvelo M4², TRAFFIPAX TraffiPhot S, TRAFFIPAX TraffiStar S 330, VDS M5 Speed, Traffipax TraffiStar S 540
Section Control
laserLaser Patrol, LAVEG, LTI 20.20 TS / KM, LR90-235 / P, Riegl FG21-P, TraffiPatrol, TraffiPatrol XR, Leivtec XV2, Leictec XV3
LidarPoliScan Speed, PoliScan M1 HP, PoliScan F1 HP
GenerallyMobile speed cameras, stationary speed cameras, black light speed cameras

Measurement errors in radar traps

Such a measuring device for speed is considered to be compared to others very error-prone, among other things because when setting up a certain angle to the roadway must be maintained. It can also become a incorrect measurement comewhen the controlled car z. B. when changing lanes the direction of travel changes or if traffic signs have a so-called Bent ray reflection cause.

Known speed cameras:

  • Traffipax Speedophot
  • Multanova 6F

Shot down: measuring the speed of a car with a laser pistol

The laser gun can be used for the stationary and mobile speed measurement can be used. Police officers who carry out a speed control in this way must be specially trained for this. Because Result in operator errors usually to incorrect measurement results, so that no notice of fines may be based on this. In the case of such measurement errors, it is worthwhile Objection against allegations of speeding.

During the measurement, the police officer aims at the license plate of the vehicle to be checked with the laser. The emitted laser pulses are from the vehicle reflected and caught again by the antennae of the pistol. In this way the speed can be determined. This speed measurement usually works without a flash. Photos are usually not taken here. Rather, the police pull the offender out of the traffic immediately after the measurement, inform him of his speeding violation and record the personal data.

Note: However, there are too Laser gauges taking a photo from the driver can shoot. The flash is then even visible.

Examples of laser measuring devices:

  • RIEGL LR90-235P
  • RIEGL FG21-P
  • LEIVTEC XV2 and XV3
  • Laser patrol
  • TraffiPatrol

Measurement error of the laser speed camera

Even when determining the speed with a laser pistol errors can creep in. especially the mobile control the speed limit is prone to this because the accuracy of the particular measurement depends on the person making it.

This meter measures the speed accurately only when it is not moving becomes. In addition, the laser speed camera only measures precisely when the Area to be measured perpendicular to the laser beam runs and if the Target optics correctly adjusted has been.

Errors when measuring speed with the laser can also have other causes: Because a laser beam is wider than a car, it can happen that the beam goes past the car and when measuring z. B. incorrectly detected and measured the vehicle in the adjacent lane.

Notices of fines based on incorrect measurements can be contested. A lawyer can e.g. B. the associated Measurement protocol for speed measurement check and use this to uncover possible errors. Those affected should weigh up whether an objection to the decision is worthwhile. Because that Procedure for checking the measurement errors is often time-consuming and costlyas if the driver were paying the fine.

Laser jammers and jammers are prohibited

It is not allowedTo prevent laser speed measuring devices from controlling their speed with the help of so-called laser jammers.

While it is permissible to buy or own such a device, it is Use is illegal on German roads. Drivers caught with a laser jammer don't have to use just one Fine of 75 euros and a point in Flensburg count, but also with the Seizure and destruction of the device. This is likely to be far more expensive for those affected than the fine, because such a disruptor or jammer costs around 500 euros.

The tolerance in the speed measurement

If a driver is flashed, the competent authority must when it determines that the speed limit is exceeded take into account a certain tolerance and subtract a few km / h from the original measurement result. That way you should possible inaccuracies in the speed measurement compensated become. Whether the measurement was actually inaccurate is not relevant for this deduction.

In principle, the same measurement tolerance applies to every speedometer, regardless of whether measurements were taken in urban, out of town or on the motorway. As a rule, it does not matter which measuring device was used.

So after the speed measurement is as follows Subtract tolerance:

  • at a speed of up to 100 km / h: 3 km / h and
  • at a speed of more than 100 km / h: 3 percent of the measured value.

If z. B. the permissible Top speed at 50 km / h lies and a Drivers flashed at 73 km / h , then after subtracting the measurement tolerance of 3 km / h a Exceeding the speed limit of 20 km / h.

When checking on the motorway, however, 3 percent of the measured speed must be deducted. Traffic offenders who at a speed limit of 100 km / h with 150 km / h on the motorway speed, a tolerance of 4.5 km / h would benefit, which is rounded up to 5 km / h. Consequently, after subtracting this value, the driver can receive a Exceeding speed by 45 km / h be accused.

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