Questions

Question 0

There are three things that can happen to a radar wave. What are they?

Answer 0

A radar wave can be reflected, refracted or absorbed.

Question 1

What are the three units that comprise traffic radar?

Answer 1

Antenna, receiver and transmitter

Question 2

How can you minimise the cosine effect when using radar?

Answer 2

Aiming the radar beam so that the angle between the radar and the target vehicle will minimise the cosine effect. Any speed difference between true speed and recorded speed will always be in the favour of the target vehicle.

Question 3

Who is permitted to use radar speed enforcement equipment?

Answer 3

Only police members who have been certified as trained operators are permitted to use radar speed enforcement equipment. This requires the member to have completed this module, achieved a minimum score of 70% in the test, undertaken 20 hours practical institution with an approved instructor who will certify competence, and even issued a certificate from traffic operations support group.

Question 4

What is the antenna component of traffic radar used for?

Answer 4

The antenna is used to aim the microwave beam at the area being monitored

Question 5

Does the width of the beam remain the same the further from the transmitter it is emitted?

Answer 5

No, the further the beam extends from the radar the wider it becomes.

Question 6

What factors can affect the radar?

Answer 6

Weather conditions such as rain mist and fog will affect radar range. Local terrain such as hills corners fences and buildings will also have some effect. Road undulations will also reduce the range and cause fading to the return signal

Question 7

How can the operator reduce the target range?

Answer 7

The range control is used to reduce range

Question 8

What affect does vehicle size and shape have on the strength of the reflected signal

Answer 8

The size and shape of the target vehicles surface will affect the information sent back to the radar unit. The bigger the target the better it will act to reflect the signal back to the radar unit. A target be hole that is sample and aerodynamically designed is a poor reflector, eh oh means it will need to be closer to the unit to be picked up clearly.

Question 9

There are two major things that you need to consider when selecting a stationed operating site. What are they?

Answer 9

Operation and safety

Question 10

Establishing track history for all radar speed checks requires three elements. What are they?

Answer 10

Visual obs
Audio confirm
Radar verify

Question 11

Detail each part of visual obs

Answer 11

Identify the target vehicle and continue to monitor it’s travel
Confirm the target is within radar range
Estimate target speed

Question 12

Three parts of Audio confirm

Answer 12

Listen for a clear Doppler tone
Check Doppler time consistent with speed
Check level of signal heard is strong and not fluctuating in audio

Question 13

Three parts of rAdar verify

Answer 13

Check initial reading is consistent with visual obs an operator estimated speed
Ensure a steady target reading
Check reading consistent with both visual obs an audio tone
Confirm ground speed readings by patrol speedo

Question 14

What are the tuning forks used for?

Answer 14

Tuning forks are used to simulate speed. Each fork is stamped with an operating band and speed and the fork will produce this when struck.
It is then used to test that the unit is detecting the speed
Acuaratly.

Question 15

What is the Doppler shift?

Answer 15

The speed radar detects a movement between the teas miffed and received signal. This change in freq. is known as the Doppler shift. Simply the radar unit determined the frequency difference between the signals transmitted from the radar and the signals reflected from the target. The change in the tone is the Doppler shift frequency.

Question 16

Why is a certified speedo required when operating traffic radar?

Answer 16

As part of the accuracy testing of the unit the speed f the patrol vehicle is checked against the patrol speed detected by the radar unit. Before using the unit the match between the patrol speed and the speed detected by the unit must be without +/- 3kmh. This is used to confirm unit accuracy.

Question 17

What reasons are there for loss of ground speed?

Answer 17

Ground speed may be lost because of rain, a wet road surface, a badly sighted antenna or when the hold button is released without a clear road in front (the device becomes confused and no reading is shown)

Question 18

Is it a requirement to lock every speed reading when conducting an enforcement stop?

Answer 18

While it is preferred it is not essential.

Question 19

what sort of beam does a laser use?

Answer 19

A laser is a concentration of kight energy into a high intensity beam

Question 20

When selecting a site for operating a traffic laser what factors should be taken into consideration?

Answer 20

The operator must consider the
Cosine angle
A clear line of sight
Weather conditions
Whether the operation is from inside the patrol vehicle
Movement of unit
Other factors such as sweep effect, reflection influences and night operation

Question 21

The traffic laser should not be used in certain weather conditions.nmae these

Answer 21

Fog snow heavy rain

Question 22

What happens to the range if laser used inside window

Answer 22

Range is reduced

Question 23

What effect does using the laser thriugh the windscreen of a patrol vehicle have on the accuracy of the units speed reading

Answer 23

Although range is reduced there is no effect in accuracy

Question 24

Where on target vehicle should laser be aimed?

Answer 24

Between headlights at the number plate of target vehicle

Question 25

How to minimise cosine effect

Answer 25

The position of the traffic laser to the roadway creates an angle that reduces the speed reading of target vehicle. While the angle cannot be eliminated entirely , if can be minimized by the operator reducing the angle to a minimum

Question 26

What effect does operator movement have on target vehciles speed reading?

Answer 26

Operator movement cause the laser unit does reading to disappear.

Question 27

When considering laser devices at night time, what additional factors should be considered?

Answer 27

Night operation and headlights will reduce the range if traffic laser. Headlights of newer cars may interfere with laser ability to detect the reflected laser pulse. To avoid this, the operator should aim between the vehciles headlights at Humber plate area

Question 28

Describe effect vehicle size and shape have when a traffic laser is operated

Answer 28

The larger ten vehicle the easier it is to detect. Small vehciles are harder to detect.

Question 29

Which mode May laser be operated in?

Answer 29

StAtionery only

Question 30

What elements are required to establish tracking history?

Answer 30

Visual estimation
Audio tone
Comparison of the digital readout with the operator estimate
Of speed