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From YouTube: Roundabout Construction Part 2 of 3
Description
Produced in 2003, this program shows the design and construction process in the building of Bend's first roundabouts. There are now nearly two dozen roundabouts in the City of Bend.
A
What
what's
happening
are
that
the
intersections
on
our
arterioles
and
collectors
are
getting
to
a
point
with
the
volumes
that
even
a
four-way
stop
is
really
delay
in
the
motorist.
What
so,
what
it
is
is
those
intersections
now
that
have
met
warrants
for
a
signal.
We
analyzed
that
intersection
and
see
if
an
a
roundabout
is
appropriate
and,
if
appropriate,
in
lieu
of
a
signal
we
do.
The
roundabout
I
would.
B
Agree
that
a
roundabout
is
much
more
enjoyable
to
design
than
a
signalized
intersection.
One
concern
people
have
is
that
it
may
take
additional
right
away
and
right
at
the
intersection
that
could
be
true,
but
there's
also
a
possibility
compared
to
a
roundabout
to
a
signalized
intersection.
It
may
take
more
right
away
away
from
the
intersections
to
accommodate
additional
lanes
and
around
about
the
additional
right
away
is
concentrated
at
the
intersection.
The.
C
Roundabouts
offer
more
attractive
design
over
traditional
intersections.
Where
you
have
a
massive
pavement,
you
have
wires.
You
have
posts
to
have
lights,
to
something
where
you're
able
to
have
landscaping,
you're
able
to
have
attractive
surface
treatments
such
as
scored
pavement
its
overall.
It's
just
a
better
design.
It's
more
aesthetically
pleasing
design
that
fits
better
into
neighborhoods.
The.
D
Federal
government
has
a
has
a
roundabout
design
guide
that
kind
of
gives
some
maximum
entry
speeds
for
roundabouts
and
they
range
from
15
to
30
miles
per
hour,
depending
on
if
they're,
urban
or
rural,
single
lane
or
double
lane
and
in
been
all
of
ours
are
urban
single
lane.
So
far,
so
we've
gone
with
the
15
miles
per
hour,
which
is
the
recommended
maximum
entry
speed.
For
that,
however,.
E
The
single
lane
roundabouts
around
town,
there
is
a
truck
apron
in
the
center
island,
which
is
designed
specifically
for
the
trailer
of
larger
vehicles
for
the
trucks
for
people
pulling
trailers
to
be
able
to
navigate
through
there
without
driving
up
and
over
landscape,
but
also
still
allows
vehicles
to
travel
more
slowly
depending
on
the
size
of
the
truck
they
use
more
or
less
of
the
apron
as
needed.
We.
D
B
A
roundabout
does
accommodate
odd
shaped
intersections
better
than
a
stop
sign.
Ideally
around
about
the
angle
between
the
different
legs
would
be
equal,
but
I
think
it
also
works
better
than
a
typical
intersection
that
it
does
come,
give
it
odd
angles.
The
biggest
thing
we
had
to
consider
in
this
intersection
is
the
truck
turning
movement
on
a
sharp.
E
Angle,
contrary
to
a
signalized
intersection,
where
you
have
a
straight
path
and
oftentimes
people
tend
to
speed
up
to
try
to
make
the
end
of
a
light
on
a
roundabout,
you
have
to
slow
down
there
for
all
the
movements
in
a
roundabout
are
done
at
slow
speeds.
It
all
gives
people
the
opportunity
to
stop
easily.
It
also
allows
them
to
adjust
to
other
traffic
very
easily,
probably.
B
F
Offer
many
attributes
that
are
superior
to
traffic
signals
and
4-way
stop
installations
and
even
old
traffic
circles.
Three
main
features
of
around
about
are
the
yield
at
entry,
the
flare
and
the
deflection.
The
yield
at
entry
means
you
don't
necessarily
have
to
stop
to
keep
moving.
The
flare
actually
turns
a
vehicle,
so
it's
turned
in
the
right
direction,
so
you
go
the
right
way
plus
he
increase
your
visibility.
The
deflection
is
really
the
main
feature
of
roundabouts.
That
slows
traffic.
So
you
have
to
divert.
You
can't
drive
a
straight
line
through
the
intersection
when.
D
A
G
We
get
more
experience,
we're
finding.
There
are
pros
and
their
cons
as
well
pros
being
predominantly
we
we
think
they're
preferable
over,
for
we
stop
and
when
traffic
is
moving
through
those
we
do
very
well
and
also
being
able
to
to
go
through
those
roundabouts
at
a
good
speed.
So
we
don't
lose
response
times
well,.
H
They
obviously
do
slow
us
down
somewhat,
because
you
know
it's
an
obstacle
in
the
roadway
and
it's
an
area
where
we're
going
to
encounter
other
vehicles
and
the
roundabout
limits.
The
amount
of
space
those
vehicles
have
to
to
clear
the
intersection
for
us
and
around
about
itself
is
an
obstacle.
We
can't
go
around
the
stopped
vehicles,
but
the
amount
of
time
that
we
lose
is
really
very
minimal.
On.
G
E
G
An
example
when
we're
approaching
around
about
we
don't
want
people
to
pull
off
within
the
roundabout
to
the
right.
The
way
they're
normally
used
to.
We
want
them
to
move
out
of
the
way
and
clear
the
roundabout
completely,
so
we
can
get
around
it
if
they
just
pull
to
the
right.
Sometimes,
that's
not
good
enough.
Although
we've
worked
I
think
hand-in-hand
with
engineering
to
to
get
the
best
designs,
we
can
we
have
had
times
when
we've
had
to
work
through
those
very
slow,
because
the
public
is
not
reacting
properly.
Initially,.
H
It's
generally
confusing
for
people,
something
new,
something
that
you
don't
encounter
very
often,
and
you
know
they're
hesitant
to
go
into
room.
There
seem
to
be
somewhat.
You
know
early
on
confused
about
how
you
go
through
them,
signaling
to
get
in
signaling
to
get
out
it's
just
like
any
other
traffic
control
device.
That's
out
there.
The
more
people
adhere
to
the
rules
are
courteous,
use
their
turn
signals
keep
their
speeds
reasonable,
the
better
they
function
for
everybody
around.
So.
F
The
environmental
ish
attributes
of
it
are,
it,
reduces
sound.
The
noise
generated
an
intersection
by
virtue
of
the
mass
of
a
roundabout
in
the
center
island
and
splitter
islands,
help
mitigate
the
sound
traffic
is
going
slower
and
there's
less
stop
and
go
traffic,
so
you
have
less
dirt
and
stop
noise
associated
with
it.
For
the
same
reason,
air
quality.
It
has
air
quality
advantages
because
you
have
less
stop
and
go
traffic
cars.