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10-Codes > 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

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2
Q

Basic Speed Law

A

316.183

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3
Q

Absolute Speed Law

A

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

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4
Q

Benefits of Speed Enforcement

A

Save Lives, Prevent Injuries, Reduce Crashes

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5
Q

Methods of Measuring Distances

A

Selecting methods of measuring
Minimizing site obstructions
Selecting reference points

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6
Q

Measure Speed Acurately

A

Minimum distance is 300 ft
Straight line not a curve

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7
Q

Basic Speed Equation

A

Speed = distance divide by time

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8
Q

Parallax

A

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

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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

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10
Q

Relative Motion

A

Motion toward or away from the RADAR

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11
Q

Radar Units Decision Process

A

Reflective capability
Position
Speed

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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

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13
Q

The stationary angular cosine effect

A

Angle created between the vehicle and the radar

More angle lowers the speed reading

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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

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15
Q

Tracking History Stationary Radar

A

Visual Estimation of target speed
Audio Doppler
Target Speed Display

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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 tha 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

10-Codes (5 decks)

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