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Arizona
has experienced incredible growth since this picture was
taken of the old Arizona Highway Department.
Now known as the Arizona
Department of Transportation, we have become one of
the largest agencies in the state. |
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Experiencing
unprecedented growth during the 1980s and the 1990s, Arizona has become
one of the most populous states in the USA. According to the US Census,
the state’s population expanded from 1,302,161 in 1960 to 5,130,632
by 2000. This represents 39.98 percent growth in just 40 years.
A sizeable decline does not seem to be on the horizon. In the 2007
Maricopa County Association of Governments Regional Transportation
Plan, Maricopa County has grown from a population of 1.5 million
persons in 1980, to a population of 3.7 million in 2005. By 2030,
Maricopa County is projected to double in population over the 2000
base population, with an anticipated total of 6.1 million people.
This means that the region will experience a growth of approximately
one million people during each decade. |
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Such an increase in the number of people migrating to the state
has resulted in a dramatic increase in the traffic. And will
continue to do so.
More cars, trucks, tractor trailers, moving vans, motor homes
and motor cycles -- to mention just a few of the vehicles on
our roads and highways -- add up to a lot more traffic.
In November of 2006, The Arizona Republic stressed that “Arizona
now has as many registered vehicles, from mopeds to trucks,
as people -- including babies. We need a lot of smart solutions
to avert perpetual gridlock.” |
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Did you know . . . the modern roundabout can reduce traffic injuries and fatalities? |
COPING
WITH INCREASED TRAFFIC
Throughout the United States, Departments of Transportation
are exploring new methods of traffic control management. The
modern roundabout, which is different from traditional intersections,
is one of the options.
By understanding what a modern roundabout is, and how it works,
motorists are able to travel through intersections easier and
safer. Simply stated the modern roundabout is a type of raised
intersection with no traffic lights.
Because it is round, some people confuse it with a traffic circle
or rotary often referred to as gyratory systems.
The most important difference between the modern roundabout
and these “gyratory” involves the
right-of-the-way.
The modern roundabout is being used in hundreds of communities
throughout the United States because it is a safer way to move
traffic through intersections. |
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Did you know . . . the modern roundabout can increase traffic flow? |
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BENEFITS OF MODERN ROUNDABOUTS
Visit the Insurance Institute for Highway Safety (IIHS), check out Research and Stats then locate roundabouts for more information on safety factors. Some of the most important benefits of the modern roundabout are:
- Reduces injury accidents by 75 percent and fatal accidents by 90 percent.
- Increases efficient traffic flow up to 50 percent.
- Helps the environment by reducing carbon emissions by double digits.
- Decreases fuel consumption by as much as 30 percent.
- Costs less than traffic signals and does not require expensive equipment or maintenance.
Red dots indicate 32 Vehicle to Vehicle conflict
points in a standard four way intersection. |
Red dots indicate 8 Vehicle to Vehicle conflict
points in a Modern Roundabout. |
Did you know . . . the modern roundabout helps the environment by reducing fuel consumption and carbon emissions? |
THE MODERN ROUNDABOUT IS EASY TO USE
In addition to increasing public safety and traffic efficiency while reducing pollution and fuel consumption, the modern roundabout is easy to use. When motorists follow the golden rule -- you never merge; all motorists approaching a roundabout must yield -- modern roundabouts can increase the traffic flow. |
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“Initially I was somewhat skeptical however I'm supportive of modern roundabouts now. The roundabout at Tyler Parkway is an asset to our community. Drivers just need to follow some simple rules. Yield to traffic in the roundabout, slow down, look left and move right”. Payson Police Chief Donald Engler |
Large Vehicles and Roundabouts Video |
Large Vehicles Negotiating a Roundabout
9:42 minutes |
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The modern roundabout is not built for speed. While the basics are easy remember to go SLOW!
Slow down to 15-25 mph when entering.
Let vehicles already circulating go ahead.
Obey all one way signs.
Watch for pedestrians, bicyclists, emergency and large vehicles. |
MODERN ROUNDABOUT ANIMATIONS
The Users Guide offers more details and the following animations will "walk you through" several modern roundabout scenarios. You will experience how easy it is to enter and exit a modern roundabout and what will result with improper use. |
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Choosing the proper lane. |
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Yield to pedestrians. |
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What to do when encountering emergency vehicles. |
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Using the truck apron for large vehicles. |
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Improper lane change results in crash. |
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Wrong assumption leads to crash. |
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Did you know . . . the highest number of fatalities caused by red light runners occur in Arizona and the Phoenix area? |
ACCLAIMED BOTH NATIONALLY AND INTERNATIONALLY
Introduced in the early 1900’s in Europe, roundabouts were redesigned as the modern roundabout in 1960. This form of traffic management was introduced to the United States in 1990. For more information about the modern roundabout, check out the History page. |
Today there are approximately
10,000 modern roundabouts in the United Kingdom,
15,000 in Australia and 20,000 in France. The modern
roundabout is also popular in South Africa, Israel,
and New Zealand.
Read
local newspaper articles on roundabouts. |
Read
national magazine coverage on roundabouts.
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The modern roundabout is becoming increasingly popular
in the United States. Twenty three states --
including Alaska, California, Colorado and Utah -- have
active roundabout programs.
The towns and cities where modern roundabouts have been
built -- even where they were initially questioned --
have come to accept this traffic control management
option with enthusiasm. Thanks to increased safety and
traffic calming as well as aesthetic considerations.
Based on sound engineering principles, safety studies,
traffic studies and community input, the Arizona Department
of Transportation began to consider the modern roundabout
as another tool for intersection and interchange improvements
in January 2004. |
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