03 roadways and control (traffic engineering هندسة المرور & prof. saad algadhi)
TRANSCRIPT
CE 436 Traffic Engineering
Topic 3: Roadways (Ch. 3.1)
& Control (Ch. 4.1)
Prof. Saad AlGadhi
CE 436 –Traffic Engineering
King Saud University
email: [email protected]
Highway & Trip Functions(Ch. 3.1)
2 Highway Functions:
Accessibility
Mobility
6 Trip Functions:
Main Movement
Transition
Distribution
Collection
Access
TerminationCE 436_KSU_Prof.AlGadhi 2
Highway Classification
4 Highway Classes:
Limited-access facilities (Freeways)
Arterials
Collectors
Local streets
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Figure 3.1 Hierarchy of Roadway Classifications
Table 3.1: Through Service Provided by Various Roadway Categories
Figure 3.2 Suburban Residential Subdivision Illustrated
Traffic Control Devices(Ch. 4.1)
3 broad categories Traffic markings
Traffic signs
Traffic Signals
A principal objective of the Manual of Uniform Traffic Control Devices (MUTCD) is to establish uniformity in traffic control devices’:
Use
Placemen, and
Design
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Purpose of Traffic Control Devices
Traffic Control Devices purpose is "to promote highway safety and efficiency by providing for orderly movement of all road users on streets and highways, bikeways, public facilities, and private property open to public travel throughout the Nation.
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Requirement for a Traffic Control Device
Five requirements for a traffic control device to be effective in fulfilling its mission.
A traffic control device must:
1. Fulfill a need
2. Command attention
3. Convey a clear, simple message
4. Command respect of road users
5. Give adequate time for a proper response
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MUTCD Contents
The MUTCD addresses three critical aspects of traffic control devices. It contains:
1. Detailed standards for the physical design of the device, specifying shape, size, colors, legend types and sizes, and specific legend.
2. Detailed standards and guidelines on where devices should be located with respect to the traveled way.
3. Warrants, or conditions, that justify the use of a particular device.
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Communicating with the Driver
The driver is accustomed to receiving a certain message in a clear and standard fashion, often with redundancy
A number of mechanisms are used to convey messages, which make use of recognized human limitations, particularly with respect to eyesight:
Color
Shape
Pattern
LegendCE 436_KSU_Prof.AlGadhi 11
Required Reading
Ch. 3: Roadways & Their Geometrics
Section 3.1
Ch. 4: Introd. to Traffic Control Devices
Section 4.1
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