High way and transportation i dis eciv 4333
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High way and Transportation I(DIS) ECIV 4333. Instructor : Dr. Essam Almasri Assistants : Eng.Mustafa abou foul. VOLUME STUDIES. VOLUME STUDIES. Average Annual Daily Traffic (AADT) The average of 24-hour counts collected every day of the year. Average Daily Traffic (ADT)

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High way and Transportation I(DIS) ECIV 4333

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High way and transportation i dis eciv 4333

High way and Transportation I(DIS) ECIV 4333

  • Instructor : Dr. Essam Almasri

  • Assistants : Eng.Mustafa abou foul


Volume studies

VOLUME STUDIES


Volume studies1

VOLUME STUDIES

  • Average Annual Daily Traffic (AADT)

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

  • Average Daily Traffic (ADT)

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


Volume studies2

VOLUME STUDIES

  • Peak Hour Volume (PHV)

    The maximum number of vehicles that pas a point on a highway during a period of 60 consecutive minutes.

  • Vehicle Classification (VC)

    With respect to the type of vehicles for cars, two-axle trucks, or three-axle trucks.


Volume studies3

VOLUME STUDIES

  • Methods of Conducting Volume Counts

    • Manual Method

    • Automatic Method


Volume studies4

VOLUME STUDIES

  • Hourly expansion factors (HEFs):

  • Daily expansion factors (DEFs):


Volume studies5

VOLUME STUDIES

  • Monthly expansion factors (MEFs):


Definition

Definition

  • Peak hour factor (PHF): the ratio of total hourly volume to the maximum 15-minute rate of flow within the hour.

  • PHF (minimum) = 0.25 ( V = Vكل المركبات تمر في ربع ساعة 15)

  • PHF (maximum) = 1 ( V=4V15المركبات موزعة علي الأرباع بالتساوي ( Steady flow.


Example

Example:

  • The following traffic counts were made during an hour-long study period:

Answer:

The hourly volume = 1000+1200+1100+1000 = 4300 veh

The rates of low = [ No. of veh.] / [time(in hours)]


Example1

Example

  • In the volume study of Al-Moassasa Street in the old city of Gaza, the following data was collected. for 15 minute periods as shown in the table below.

    a)Complete the table of data collection.

    b)Find the peak hour.

    c)Determine the peak hour volume.

    d)Calculate the peak hour factor (PHF).


Table of data

Table of data


Calculation

Calculation


Travel time and delay studies

TRAVEL TIME AND DELAY STUDIES

  • Travel time:

    is the time taken by a vehicle to traverse a given section of a highway.

  • Running time:

    is the time a vehicle is actually in motion while traversing a given section of a highway.


High way and transportation i dis eciv 4333

  • Delay:

    is the time lost by a vehicle due to causes beyond the control of the driver.

  • Operational delay:delay caused by the impedance of other traffic.

    (for example, parking or un parking vehicles).


High way and transportation i dis eciv 4333

  • Fixed delay:

    is that part of the delay caused by control devices such as traffic signals. This delay occurs regardless of the traffic volume or the impedance that may exist.

  • Stopped-time delay:

    is that part of the delay during which the vehicle is at rest.


Methods for conducting travel time

Methods for Conducting Travel Time

1- Those using a test vehicle

  • Floating-Car Technique.

  • Average-Speed Technique.

  • Moving- Vehicle Technique.

    2- Those not requiring a test vehicle.

  • License-Plate Observations.

  • Interviews.

  • ITS Advanced Technologies.


Moving vehicle technique

Moving- Vehicle Technique

  • The observer starts collecting the relevant data at section X-X, drives the car eastward to section Y-Y, then turns the vehicle around and drives westward to section X-X again.


Moving vehicle technique1

Moving- Vehicle Technique

  • The following data are collected as the test vehicle makes the round trip:

  • The time it takes to travel east from X-X to Y-Y (Te), in minutes.

  • The time it takes to travel west from Y-Y to X-X (Tw), in minutes.

  • The number of vehicles traveling west in the opposite lane while the test car is traveling east (Ne).

  • The number of vehicles that overtake the test car while it is t rave ling west from y-y to X-X, that is, traveling in the westbound direction (Ow).

  • The number of vehicles that the test car passes while it is traveling west from Y-Y to X-X, that is, traveling in the westbound direction (PW).


Parking studies

PARKING STUDIES


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