Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Speed Measurement > Speed Measurement > Flashcards

Speed Measurement Flashcards

1
Q

85th Percentile

A

The speed at or below that 85 percent of drivers travel on a road segment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Basic Speed Law

A

316.183

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Absolute Speed Law

A

Speed limit that is in force at all times regardless of enviromental conditions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Benefits of Speed Enforcement

A

Save Lives, Prevent Injuries, Reduce Crashes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Methods of Measuring Distances

A

Selecting methods of measuring
Minimizing site obstructions
Selecting reference points

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Measure Speed Accurately

A

Minimum distance is 300 ft
Straight line not a curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Basic Speed Equation

A

Speed = distance divide by time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Parallax

A

Apparent movement of a fixed object when the viewer changes his or her position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Doppler Principal

A

Relative motion is motion towards or away from the Radar
Frequency of a radar signal changes due to relative motion
Amount of frequency change is dependent upon the speed of a vehicle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Relative Motion

A

Motion toward or away from the RADAR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Radar Units Decision Process

A

Reflective capability
Position
Speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How the Dopler Principal applies to stationary RADAR

A

As the target approaches the signal frequency increases
As the target recedes the signal frequency decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The stationary angular cosine effect

A

Angle created between the vehicle and the radar

More angle lowers the speed reading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Factors Affecting Stationary Radar

A

Scanning effect - rapid swinging of radar unit causes incorrect reading

Panning Effect - Pointing the antenna at the counting unit causes incorrect reading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Tracking History Stationary Radar

A

Visual Estimation of target speed
Audio Doppler
Target Speed Display

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Moving radar

A

Uses Doppler principle to determine speed
Transmits one signal but monitors many reflected signals
Processes two reflected signals and determines two speed reading
(Low freq and High freq)

17
Q

Moving Angular Cosine Effect

A

Vehicle approaching towards or receding from a radar could create lower than actual speed

Moving Cosine lowers the patrol speed reading and raises the target speed reading

18
Q

Completing A Tracking History

A

Visual estimation
Audio Doppler
Target Speed Display
Patrol Speed Verification ( moving radar only)

19
Q

Direction Sensing Radar Device

A

Determines if the signals frequency is higher or lower than the transmitted frequency

Reflected signal is higher, vehicle is approaching
Reflected signal is lower, vehicle is moving away

20
Q

Radar range = Radar sensitivity

A

adjusting the radar sensitivity is to eliminate unwanted interference

21
Q

Proper device setup

A

Antenna - Box - Current

22
Q

Radar Device Testing

A

Operator is responsible to twice daily before and after shift

23
Q

Theodore Maiman

A

Made the first laser

24
Q

LASER

A

Light
Amplification
Stimulated
Emission
Radiation

25
Q

Light is measured by…

A

Wavelength

26
Q

Light will travel forever unless…

A

Reflected
Refracted
Absorbed

27
Q

Laser light spreads…

A

Very slowly

28
Q

Lasers use…

A

Gallium Arsenide Diodes

29
Q

Laser pulses per second…

A

100-300

30
Q

Time of Flight

A

The time it takes an object, wave or particle to travel

31
Q

Sweep Error

A

movement of laser = sweeping which will cause an error

32
Q

Light test…

A

Determines that all display indicators are working

33
Q

Internal Test….

A

built in by the manufacturer

34
Q

Laser tracking history

A

Estimate target speed
ensure audio tone
obtain readout on the device
confirm the targets direction of travel
Identify that the unit provides a distance readout

35
Q

Reflection Error

A

beam reflecting off of moisture or heat waves

Speed Measurement (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions