Chapter 4.0 To 4.1

Question 1

3 main categories of traffic studies

Answer 1

Inventories, Administrative Studies, Dynamic Studies

Question 2

Conducted to Estimate the distribution speeds of vehicles in a stream of traffic at a particular location on a hughway.

Answer 2

Spot speed studies

Question 3

This requires that drivers be UNAWARE that such studi is being conducted.

Answer 3

Spot Speed Studies

Question 4

The duration of Spot speed studies are:

Answer 4

Atleast 1 hour and sample size is 30 vehicles

Question 5

Which is the arithmetic mean of all observed vehicle speeds.

Answer 5

Average Speed

Question 6

Which is the speed at the middle value in a series of spot speeds that are arrange in ascending order.

Answer 6

Median Speed

Question 7

Which is the speed value that occurs most frequently in a sample spot speeds.

Answer 7

Modal Speed

Question 8

Which is the range of speed usually taken 10 mi/h intervals that has the greatest number of observations.

Answer 8

Pace

Question 9

Which is a measure of the spread of the individual speeds.

Answer 9

Standard Deviation of Speeds

Question 10

Statistical measurement of the spread between numbers in a data set.

Answer 10

Variance

Question 11

A measure of how dispersed the data is in relation to the mean.

Answer 11

Standard Deviation

Question 12

Used to determine the sample sizes for traffic engineering studies.

Answer 12

Probability Theory

Question 13

2 methods for conducting spot speed studies

Answer 13

Manual and Automatic

Question 14

2 general categories of Road Detectors

Answer 14

Pneumatic Road Tubes and Induction Loops

Question 15

Are laid across the lane in which data are to be collected.

Answer 15

Pneumatic Road Tubes

Question 16

A rectangular wire loop buried under the roadway surface.

Answer 16

Inductive Loop

Question 17

The presence of vehicles is detected through electronic means and information is obtained.

Answer 17

Electronic - Principle Detector

Question 18

Work on the principle that when signal is transmitted on the vehicle the reflected signal is proportional to the speed of the moving vehicle.

Answer 18

Radar- Based Traffic Sensors

Question 19

Conducted to collect data on the number of vehicles and or pedestrians that pass point on highway in specified period of time.

Answer 19

Traffic Volume Studies

Question 20

Is the average of 24- hour counts collected every day of the year.

Answer 20

AADT - Average Annual Daily Traffic

Question 21

Is the average of 24-hour counts collected over a number of days greater than one but less than a year.

Answer 21

ADT - Average Daily Traffic

Question 22

Is the maximum number of vehicles that pass point on a highway during a period of 60 consecutive minutes.

Answer 22

PHV - Peak Hour Volume

Question 23

Records volume with respect to the type of vehicles, example passemger cars, two axle trucks or three.

Answer 23

VC - Vehicle Classification

Question 24

Is a measure of travel along a section of road.

Answer 24

VMT - Vehicle Miles of Travel

Question 25

Involves one or more persons recording observed vehicles using a counter.

Answer 25

Manual Counting

Question 26

Those that require the laying of detectors and do not require the laying detectors.

Answer 26

Automatic Counters -

Question 27

Particularly suitable for cities and counties, capable obtaining per vehicle or volume data.

Answer 27

Apollo Counter/ Classifier

Question 28

Is an autonomous system that does not require any cabling.

Answer 28

The Traffic Eye Universal

Question 29

The area which the data required is cordoned off by imaginary closed loop.

Answer 29

Cordon Counts

Question 30

The study area is divided into large section by running imaginary lines.

Answer 30

Screen line counts

Question 31

Are taken to determine vehicle classifications, through movements, and turning movements at intersections.

Answer 31

Intersection Counts

Question 32

Are made at loactions such as subways stations, midblocks and crosswalks.

Answer 32

Pedestrian Volume Counts

Question 33

In order to obtain certain traffic volume data, suach as AADT it is necessary to obtain data continously.

Answer 33

Periodic Volume Counts

Question 34

These counts are taken continous ly using a mechanical or electronic counters.

Answer 34

Continous Counts

Question 35

Stations which continous counts are taken.

Answer 35

Permanent Count Stations

Question 36

Strategically located so that representative samples of traffic volume can be taken on each type of highway counting program.

Answer 36

Control Counts

Question 37

This counts are used to estimate ADT, using expansion factors developed from control counts.

Answer 37

Coverage Counts

Question 38

These Maps show traffic volumes on individual routes.

Answer 38

Traffic Flow Maps

Question 39

This sheets are graphic representations of the volume and direcfions of all traffic movements through the intersection.

Answer 39

Intersection Summary Sheets

Question 40

These charts show the hourly, daily,monthly or annual variatikns in traffic volume in an area.

Answer 40

Time-Based Distribution Charts

Question 41

These table give a summary of traffuc volume data such as PHV.

Answer 41

Summary Tables