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)

The average of 24-hour counts collected over a

number of days greater than one but less than a

year.

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 STUDIES

Methods of Conducting Volume Counts

– Manual Method

– Automatic Method

VOLUME STUDIES Hourly expansion factors (HEFs):

Daily expansion factors (DEFs):

VOLUME STUDIES

Monthly expansion factors (MEFs):

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 = V ساعة ربع في تمر المركبات 15كل ) PHF (maximum) = 1 ( V=4V15 بالتساوي األرباع علي موزعة المركبات

( Steady flow.

Example:

The following traffic counts were made during an hour-long

study period:Time

periodNumber of

vehicle (veh)

5:00 –5:15 1000

5:15 –5:30 1200

5:30 –5:45 1100

5:45 –6:00 1000

Answer:The hourly volume = 1000+1200+1100+1000 = 4300 vehThe rates of low = [ No. of veh.] / [time(in hours)]

Time period Number of vehicle (veh)

Rate of flowvph

5:00 –5:15 1000 1000/0.25 = 4000

5:15 –5:30 1200 1200/0.25 = 4800

5:30 –5:45 1100 1100/0.25 = 4400

5:45 –6:00 1000 1000/0.25 = 4000

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 Time NO.

3:00 - 3:15 1253:15 -3:30 1293:30 - 3:45 1333:45 -4:00 1394:00 - 4:15 1444:15 -4:30 1484:30 - 4:45 1504:45 -5:00 1645:00 - 5:15 1785:15 -5:30 1745:30 - 5:45 1695:45 -6:00 1606:00 -6:15 1506:15 -6:30 1416:30 - 6:45 1316:45 -7:00 128

CalculationTime NO.

3:00 - 3:15 125

3:15 -3:30 129

3:30 - 3:45 133

3:45 -4:00 139 526

4:00 - 4:15 144 545

4:15 -4:30 148 564

4:30 - 4:45 150 581

4:45 -5:00 164 606 Peak hour = 4:45 - 5:45

5:00 - 5:15 178 640

5:15 -5:30 174 666 Peak Hour Volume = 685

5:30 - 5:45 169 685 685

5:45 -6:00 160 681 PHF 0.96

6:00 -6:15 150 653

6:15 -6:30 141 620

6:30 - 6:45 131 582

6:45 -7:00 128 550

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.

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).

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 Time1- Those using a test vehicleFloating-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 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 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