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ATSSA
Traffic
Control
Supervisor
Re-certification
(missing
some
basics)
L=(WS²)/60
for
40
MPH
or
less,
L=WS
for
45
MPH
or
more
-
ANS
Formula
for
Min.
taper
length
The
off
peak
85th
percentile.
Which
is
the
speed
at
or
below
which
85%
of
vehicles
travel
operating
speed
in
free
flow
conditions
-
ANS
speed
used
in
formulas
should
be
125'
-
ANS
Distance
of
L
for
25
MPH
with
12'
Lane
width
245'
-
ANS
Distance
of
L
for
35
MPH
with
12'
Lane
width
540'
-
ANS
Distance
of
L
for
45
MPH
with
12'
Lane
width
660'
-
ANS
Distance
of
L
for
55
MPH
with
12'
Lane
width
780'
-
ANS
Distance
of
L
for
65
MPH
12'
Lane
width
L
Minimum
-
ANS
Merging
Taper
Length
1/2
L
Minimum
-
ANS
Shifting
Taper
Length
1/3
L
Minimum
-
ANS
Shoulder
Taper
Length
50'-100'
regardless
of
speed
6
devices
10'-20'
apart
-
ANS
One-Lane,
Two-Way
Taper
(Flagger
taper)
Length
and
number
of
devices
50'-100'
per
lane
-
ANS
Downstream
taper
Length 2L
-
ANS
Tangent
distance
(between
tapers)
1/2L
-
ANS
Tangent
distance
before
shifting
taper
Buffer
Space
Work
Space
Traffic
Space
-
ANS
Activity
Area
Sub-components
(3)
Recovery
Area
for
errant
vehicles:
Forgiving
design
Protects
workers
and
Motorists
Always
completely
empty
or
clear
No
vehicles,
truck-mounted
attenuator,
equipment,
or
materials
STRONGLY
RECOMMENDED:
unless
there
is
a
documented
reason
not
to
-
ANS
Longitudinal
Buffer
Space
Where
road
users
are
returned
to
their
normal
path
extends
from
the
downstream
end
of
the
work
area
to
the
last
device
such
as
end
work
zone
sign
May
contain:
end
work
zone
sign:
usually
500'
past
last
device
downstream
taper
=
50'-100'
per
lane
-
ANS
Termination
Area
is:
can
contain:
(2)
100'
-
ANS
Recommended
Advanced
Warning
Sign
Spacing:
Urban
(low
speed)
350'
-
ANS
Recommended
Advanced
Warning
Sign
Spacing:
urban
(high
speed)
500'
-
ANS
Recommended
Advanced
Warning
Sign
Spacing:
Rural
1000',
1500',
and
2640'
-
ANS
Recommended
Advanced
Warning
Sign
Spacing:
freeways
and
expressways
(3)
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