Traffic Calming Measures [Read-Only] - City of Inglewood

PROPOSED USES OF 

Traffic 

Calming 

Measures 

CITY OF INGLEWOOD 

DEPARTMENT 

OF 

PUBLIC WORKS 

1

What Is Traffic Calming? 

• Definitions of traffic calming can vary: This focuses on slowing 

the traffic and compel drivers to slow down, or focus on the 

control of traffic volumes like the use of barriers to divert traffic. 

• Traffic calming can involve changes in street alignment, such as 

installation of barriers, and other physical measures to reduce 

traffic speeds. 

• Traffic calming can employ a combination of physical measures 

that reduce the negative effects of motor vehicle use, alter 

driver behavior and improve conditions for pedestrians. 

2

Types of Traffic Calming 


Traffic calming measures can be separated into two groups 

1) Volume Control Measures, and 

2) Speed Control Measures. 

Volume Control Measures… 

…Are primarily used to address cut-through traffic problems by 

blocking certain movements. 

3

Volume Control Measures 

Full Closure 

Full Closures 

Palo Alto, CA 

Barriers placed across a street to completely close the street to throughtraffic, 

usually leaving only sidewalks open. 

4


Half Closure 

Half Closures 

Sacramento, CA 

a.k.a. Partial Closures, One-Way Closures. 

Half closures are barriers that block travel in one direction 

for a short distance on otherwise two-way streets. 

5


Diagonal Diverters 

Chester & 65th 

Gay & 66th 

Gay & 68th 

Long & 65th 

Long & 67th 

Diagonal Diverters 

Diagonal diverters are barriers placed diagonally across 

an intersection, blocking through movement. 

6


Median Barriers 

Median Barriers 

Phoenix, AZ 

a.k.a. Median Diverters, Island Diverters. 

Median barriers are islands which blocks through movement 

at a cross street. 

7


Forced Turn Islands 

Forced Turn Islands 

a.k.a. Forced Turn Channelizations, Pork Chops, Right Turn Islands. 

These are islands that block certain movements on approaches at an 

intersection. 

8


Star Diverter 

One Way - Two Way 

Boulder, CO 

Star Diverter 

a.k.a. Center (Multiple) Turn Island. 

A form of Forced Turn Channelization, center of an intersection 

that blocks through movements in either direction. 

9

Types of Traffic Calming 


The distinction between the two types of measures is not 

as clear as their names suggest, since 

speed control measures frequently divert traffic 

to alternate routes, and 

volume control measures usually slow traffic. 

Speed Control Measures 

Speed control measures are primarily used to address 

speeding problems by a changing vertical or horizontal 

alignment, or narrowing the roadway. 

10

Speed Control Measures/ 

Speed Humps 

Speed Humps Portland, OR - 14' 

a.k.a. Road Humps, Undulations. 

Speed humps are rounded raised areas placed across the road. 

11

Examples of Speed Humps 

…in Inglewood 

v 

v 

v 

v 

v 

v 

83 rd St./ Van Ness & 4 th Ave. 

88 th St. / 6 th & 8 th Ave. 

118 th Pl./ Lemoli & Dehn 

Cedar St./ Hillcrest & Buckthorn 

Hillsdale St./ La Cienega & Beach 

Queen St./ Eastwood & Prairie 

12


Speed Tables 

Tallahassee, FL 

Speed Tables 

a.k.a. Trapezoidal Humps, Speed Platforms. 

Speed tables are flat-topped speed humps often constructed 

with a brick or other textured materials on the flat section. 

13


Raised Crosswalks 

Raised Crosswalks 

a.k.a. Raised Crossings, Sidewalk Extensions. 

Raised Crosswalks are speed tables outfitted with crosswalk markings 

and signage to channelize pedestrian crossings, providing pedestrians 

with a level street crossing. 

14


Raised Intersection 

Cambridge, MA 

Raised Intersections 

a.k.a. Raised Junctions, Intersection Humps, Plateaus. 

Flat raised areas covering entire intersections, with ramps on all 

approaches and often with brick or other textured materials on the 

flat section. 

15


Textured Pavement 

Textured Pavements Winter Park, FL 

Such as brick or stone surfaces, cause drivers to have a slightly 

bumpy ride over an extended distance, while improving the 

aesthetic quality of the street environment. 

16


Traffic Circles 

Traffic Circles 

Boulder, CO 

a.k.a. Rotaries, Intersection Islands. 

Traffic circles are islands, placed in intersections, around 

which traffic circulates. 

17


Roundabouts 


Roundabouts 

a.k.a. Rotaries. 

Roundabouts require traffic to circulate counterclockwise 

around a center island. Unlike traffic circles, roundabouts are 

used on higher volume streets to allocate rights-of-way among 

competing movements. 

18


Chicanes 

City of Inglewood, Market Street 

Chicanes 

a.k.a. Deviations, Serpentines, Reversing Curves, Twists. 

Chicanes are curb extensions or islands that alternate from 

one side of the street to the other, forming S-shaped curves. 

19


Realigned Intersections 

Seattle, WA 

Realigned Intersections 

a.k.a. Modified Intersections. 

Realigned intersections are changes in alignment that convert 

T-intersections with straight approaches into curving streets 

meeting at right angles - a straight shot along the top of the T 

becomes a turning movement. 

20


Neckdowns 

Neckdowns 

a.k.a. Nubs, Bulb outs, Knuckles, Intersection Narrowing, 

Corner Bulges, Safe Crosses. 

Neckdowns are curb extensions at intersections that 

reduce roadway width curb-to-curb. 

Cambridge, MA 

21


Center Island Narrowings 

Center Island Narrowing 

Portland, OR 

a.k.a. Mid block Medians, Median Slow points, Median Chokers. 

Center island narrowing are islands located along the centerline 

of a street that narrow the street at that location. 

22


Chokers 

Howard County, MD 

Chokers 

a.k.a. Pinch Points, Mid block Narrowing, Mid block Yield 

Points, Constrictions. 

Chokers are curb extensions or islands on one or 

both sides of the street that narrow the street at that location. 

23


Combined 

Speed Hump with Choker 

Bellevue, WA 

Raised Intersection with Neckdown 

Toronto, Ontario 

Center Island with Neckdown 

Eugene, OR 

Diverter-Closure 

San Jose, CA 

24


More Combined 

Center Island with Tables 

Boulder, CO 

Center Island with Chokers 


Center Island with Humps 

Montgomery County, MD 

Raised Crosswalk with Choker West Palm Beach, FL 

25


Other Options 

Intersection Jiggle Bumps 

Dayton, OH 

Hammerhead 

Beaverton, OR 

Split Median 

Portland, OR 

Angle Point 

Bellevue, WA 

Lateral Shift 

West Palm Beach, FL 

Median Choker 

San Jose, CA 

26

Summary 

Significant impacts can be realized through the use of 

Traffic Calming Measures*. 

Depending upon the number and type of factors involved: 

vSpeeds can be reduced; 

vTraffic volume can be reduced; and, 

vUsed as a safety measures, collisions can drop. 

* Based on national studies 

27

nglewood 

Public 

Works 

Department 

10/21/2003 28

Traffic Calming Measures [Read-Only] - City of Inglewood

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