TTEng 422 s2021 Module 4: Traffic Calming

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Wael ElDessouki

In this module, we will present the different tools for traffic calming and the purpose of traffic calming.

Engineering

Module 4:
Traffic
Calming
Concepts
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki Spring 2021
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Traffic Calming:
What are Traffic Calming measures?
Traffic calming measures are physical road design elements
and non-physical measures intended to reduce vehicle speeds
and improve driver attentiveness.
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
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Spring 2021

Traffic Calming Concepts:
That will results in:
Objective:
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Traffic Calming Measures: Toolbox
Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008
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Traffic Calming Measures: Problem Types
Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008
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Spring 2021

Traffic Calming Measures Selection &
Problem Types
Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008
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Spring 2021

Traffic Calming Measures Selection &
Location Type
Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008
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Spring 2021

Traffic Calming Measures & Traffic Constraints
Ref. “City of Stockton, CA, Traffic Calming Guidelines”, 2008
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Traffic Calming Concepts: Narrowing
(Bulbouts)
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Spring 2021

Traffic Calming Concepts: Narrowing (Two Lane
Chokers)
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Spring 2021

Traffic Calming Concepts : Narrowing Measures
(Center Island Narrowing)
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Spring 2021

Traffic Calming Concepts: Narrowing Measures
(Pedestrian Refuge Islands)
Before After
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Traffic Calming Concepts: Horizontal
Measures
Roundabout
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Spring 2021

Traffic Calming Concepts: Horizontal
Measures
Traffic Circle
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Spring 2021

Traffic Calming Concepts: Horizontal
Measures
Lateral Shifts
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Spring 2021

Traffic Calming Concepts: Horizontal
Measures
Chicanes
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Spring 2021

Traffic Calming Concepts: Horizontal
Measures
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Spring 2021

Traffic Calming Concepts: Non Physical
Measures
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Spring 2021

Traffic Calming Concepts: : Non Physical
Measures
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Spring 2021

Traffic Calming Concepts: : Non Physical
Measures
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Spring 2021

Traffic Calming Concepts: Vertical Measures
Speed Bump
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Spring 2021

Traffic Calming Concepts: Vertical Measures
Speed Hump
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Spring 2021

Traffic Calming Concepts: Vertical Measures
Speed Table
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Spring 2021

Traffic Calming Concepts: Divergence
Measures
Full Road Closure
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
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Spring 2021

Traffic Calming Concepts: Divergence
Measures
Partial Road Closure
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
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Spring 2021

Traffic Calming Concepts: Divergence
Measures
Diagonal Road Closure
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Spring 2021

Traffic Calming Concepts: Divergence
Measures
Median Barrier
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Spring 2021

Traffic Calming Concepts: Divergence
Measures
Forced Turn Exit
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
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Case Studies:
Speed Hump Assessment
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
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Spring 2021

Impact of Speed Hump on Capacity & LOS
 Speed humps are common traffic calming
technique that is being used in several cities allover
the world.
 The main objective of speed humps is to reduce the
speed of the traffic.
 However, it has serious impact over the overall
capacity of the approach.
After Speed Hump
Flow
Rate
Q
(veh/lane/hr)
Density
D (veh/lane/km)
Jam
Density
Critical
Density
0
Original Capacity
Without
Speed Hump
with Speed hump
0
Capacity
At Speed Hump
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
225
Spring 2021

Impact of Speed Hump on Capacity & LOS
Operational Case: Existing Facility
Example:
Study the Effect of adding a speed hump on LOS and
the Overall capacity of the following approach.
Input:
Number of Lanes = 3
Lane Width= 3.4
Median = Yes
Shoulders = 0.6
Traffic Volume = 1275
Topography (i.e. Terrain: Level /Rolling/ Mountainous)
HV% = 12% PHF = 0.9 , Access points = 6 acc. Pt. /km
Observed Speed = 70 km/hr ,
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
227
Spring 2021

End of Module 4:
TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki
228
Spring 2021

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TTEng 422 s2021 Module 4: Traffic Calming

2. Traffic Calming: What are Traffic Calming measures? Traffic calming measures are physical road design elements and non-physical measures intended to reduce vehicle speeds and improve driver attentiveness. TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 193 Spring 2021

34. Impact of Speed Hump on Capacity & LOS  Speed humps are common traffic calming technique that is being used in several cities allover the world.  The main objective of speed humps is to reduce the speed of the traffic.  However, it has serious impact over the overall capacity of the approach. After Speed Hump Flow Rate Q (veh/lane/hr) Density D (veh/lane/km) Jam Density Critical Density 0 Original Capacity Without Speed Hump with Speed hump 0 Capacity At Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 225 Spring 2021

35. Impact of Speed Hump on Capacity & LOS  Speed humps are common traffic calming technique that is being used in several cities allover the world.  The main objective of speed humps is to reduce the speed of the traffic.  However, it has serious impact over the overall capacity of the approach. Example: After Speed Hump TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 226 Spring 2021

36. Impact of Speed Hump on Capacity & LOS Operational Case: Existing Facility Example: Study the Effect of adding a speed hump on LOS and the Overall capacity of the following approach. Input: Number of Lanes = 3 Lane Width= 3.4 Median = Yes Shoulders = 0.6 Traffic Volume = 1275 Topography (i.e. Terrain: Level /Rolling/ Mountainous) HV% = 12% PHF = 0.9 , Access points = 6 acc. Pt. /km Observed Speed = 70 km/hr , TTE 422 Traffic Operations - Copyright © 2021 Wael ElDessouki 227 Spring 2021

TTEng 422 s2021 Module 4: Traffic Calming

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