- Peak Hour Factor (PHF) Definition: Hourly Volume Peak 15 Minute Volume. 4 Typically range from 0.75-0.98 What is the highest possible value? What is the lowest possible value? Peak Hour Factor (PHF) Capacity “the maximum hourly rate at which persons or vehicles can be expected to traverse a point or a uniform section of a lane.
- Volume I June 1, 2018 1-4 PART I - BACKGROUND AND PROCEDURES 1.0 Introduction The Florida Department of Environmental Protection (“Department” or “DEP”) and Florida’s five.
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Peak Hour Volume, Design Flow Rate, PHF
The following excerpts were taken from the 1994 Highway Capacity Manual, published by the Transportation Research Board.
Peak Hour and Design Hour
Capacity and other traffic analyses focus on the peak hour of traffic volume, because it represents the most critical period for operations and has the highest capacity requirements. The peak hour volume, however, is not a constant value from day to day or from season to season.
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If the highest hourly volumes for a given location were listed in descending order, a large variation in the data would be observed, depending on the type of route and facility under study.
Rural and recreational routes often show a wide variation in peak-hour volumes. Several extremely high volumes occur on a few selected weekends or other peak periods, and traffic during the rest of the year is at much lower volumes, even during the peak hour. This occurs because the traffic stream consists of few daily or frequent users; the major component of traffic is generated by seasonal recreational activities and special events.
Urban routes, on the other hand, show little variation in peak-hour. . . .
The relationship between the 15-min flow rate and the full hourly volume is given by the peak hour factor, defined in Part A of this chapter (see below).
Whether the design hour was measured, established from the analysis of peaking patterns, or based on modeled demand, the peak-hour factor (PHF) is applied to determine design hour flow rates.
Peak-hour factors in urban areas generally range between 0.80 and 0.98. Lower values signify greater variability of flow within the subject hour, and higher values signify little flow variation. Peak-hour factors over 0.95 are often indicative of high traffic volumes, sometimes with capacity constraints on flow during the peak hour.
Peak Hour 4 4 0 119
(Description of PHF from Part A, as referred to above.)
Peak rates of flow are related to hourly volumes through the use of the peak-hour factor. This factor is defined as the ratio of total hourly volume to the peak rate of flow within the hour:
Peak Hour 4
PHF = Hourly volume/Peak rate of flow (within the hour)
If 15-min periods are used, the PHF may be computed as
Peak Hour 4 4 0 1903
![Peakhour Peakhour](https://peakhourapp.com/images/image_peakhour_mainwindow.png)
PHF = V/(4 x V15)
Where
PHF = peak-hour factor,
V = hourly volume (vph), and
V15 = volume during the peak 15 min of the peak hour (veh/15 min).
PHF = peak-hour factor,
V = hourly volume (vph), and
V15 = volume during the peak 15 min of the peak hour (veh/15 min).
Where the peak-hour factor is known, it may be used to convert a peak-hour volume to a peak rate of flow, as follows:
v = V/PHF (2-3)
Where
v = rate of flow for a peak 15-min period (vph),
V = peak-hour volume (vph), and
PHF = peak-hour factor.
v = rate of flow for a peak 15-min period (vph),
V = peak-hour volume (vph), and
PHF = peak-hour factor.
Equation 2-3 need not be used to estimate peak flow rates where traffic counts are available. The chosen count interval must allow the identification of the maximum 15-min flow period. The rate may then be directly computed as 4 times the maximum 15-min count.
Many of the procedures use this conversion to allow computations to focus on the peak flow period within the peak hour. Memorytamer 1 5 1 – automatic memory freeing apple watch.
Peakhour 4.0.12 | Mac OS X | 16 MB.
Peakhour is a beautiful display of network traffic that lives in your menu bar of Mac OS. It provides a snapshot of your Internet activity or WiFi in real time.
Peakhour is perfect for monitoring network devices: Internet, WiFi, NAS, servers and more. Peakhour gives a visual real – time view of the amount of bandwidth of their devices are using. Toast titanium 17 4 20.
Peakhour can also track the overall use of the individual (optionally on an automatic regulator menses) and can also track the Internet usage, if you are in a covered or limited monthly allotment.
Some uses for Peakhour:
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– Monitoring the performance of the network and connected devices NAS, servers and other network devices.
– Check your Internet usage in real time.
– Help determine the optimal location of your wireless access point for maximum performance or troubleshoot slow WiFi.
– Follow the amount of data you are using Internet to make sure they do not go over your monthly allowance.
– Performance problems help solve Internet and decelerations.
– Verify that your ISP is providing the speeds you’re paying.
– Monitoring the performance of the network and connected devices NAS, servers and other network devices.