ALTERNATE TREATMENT - TWO LANES (Flare Rate = 2a:b)
Transcript of ALTERNATE TREATMENT - TWO LANES (Flare Rate = 2a:b)
4" Asphalt material placed on 4'-0" embankment widening unless flume inlet and slope drain is constructed.
1-10-07 Changed Bituminious to Asphalt5 S.W.K. J.O.B.
S.W.K. J.O.B.
Normal project side slope. See typical sections.
See Design Parameters table on this sheet for radius, length of curve and flare rate information.
11
Note: Flare rate of a:b and curve length of 25'-0" shall be used when
guardrail is beyond shyline, flare rate of 2 a:b and curve length of
12'-6" shall be used when guardrail is located inside the shy line.
E.W.S.
ÚLine of normal slope change
Line of normal slope changeÜ
b2a
ì Bridge
E.W.S.
E.W.S.
slope of bridge berm.
See bridge plans forThis area to be maintained
free of fixed objects.
free of fixed objects.
This area to be maintained
free of fixed objects.
This area to be maintained
5'5'
5'5' 100'-0"
Varies
50'-0"
variable
5'5'
100'-0"
50'-0"
5'5' 100'-0"
Varies
5'5'
100'-0"
31'-3"
31'-3"
30'-0"
Varies
50'-0"
31'-3"
50'-0"
Varies
30'-0"
31'-3"
30'-0"
25'-0"
25'-0"
25'-0"
25'-0"
guardrail
4'-0" from face ofguardrail
4'-0" from face of
31'-3"
10:1 or flatter
10:1 or flatter
10:1 or flatter
10:1 or flatter
a
ôb
ôb
a
E.W.S.
ô
Line of normal slope change
Line of normal slope changeÜ
ô
ab
ôb
a
100'-0"
3:1 or flat.
12.5'
10:1 or flatter
3:1 or
flatter
flatter
3:1 or
flatter
4:1 or
var.
Slo
pe
Slope varies
Slo
pe
Slope varies
Slo
pe
Slo
pe
Slo
pe
Slo
pe
6'-0" to face of rail
6'-0" to face of rail
6'-0" to face of rail
6'-0" to face of rail
6'-0" to face of railVar.
of guardrail
4'-0" fr
om face
Varies
Slo
pe
R = ô
R = ô
R = ô
R = ô
R=ô
ô
SECTION A-A
PLAN VIEW TWO LANE
Var.12'-0" 6'-0"
25' 25'
Sho. width
ab b
a
Area of Concern
4.2% Slope
Clear zone
W-beam Guardrail
Normal project side slope
(not steeper than 4:1) to
clear zone.
A
A
A
A
"D"
Area of concern
"Y"
25̂
ENLARGEMENT - AREA OF CONCERN
Area of Concern
Guardrail shall be nested and post spacing reduced
to one half of normal spacing when "Y" is less than 5'.
Rigid barrier shall be used when "Y" is less than 3'-3".
"Y"
DETAILS OF GUARDRAIL PROTECTION AT ROADSIDE OBSTACLE
4:1 or
var.
var.
6
A.L.R. T.T.R.
Added Roadside obstacle details
25'
ab
W-beam Guardrail
A
Area of Concern
Terminal Type ||
A
PLAN VIEW FOUR LANE
ì MedianÜ
Shoulder lineÜ
ÙShoulder line
ÙShoulder line
Shoulder lineÜÚFace of Guardrail
Shoulder lineÜ
ì BridgeÜ
ì Exit lanesÜ
ì BridgeÜ
ì MedianÜ
Edge of traveled wayÛ
ÚEdge of traveled way
Edge of traveled wayÛ
ÚEdge of traveled way
Edge of traveled wayÛ
ÚEdge of traveled way
ì Entering lanesÜ
Shoulder lineÛ
Edge of traveled wayÛ
ÚEdge of traveled way
ÚShoulder line
Edge of traveled wayÛ
ÚEdge of traveled way
Edge of traveled wayÛ
ÚEdge of traveled way
Shoulder lineÜ
Shoulder lineÛ
Shoulder lineÜ
Shoulder lineÛ
Shoulder lineÜ
Shoulder lineÛ
Shoulder lineÜ
ì BridgeÜ
Úì
ìÜ
ìÜ
ìÜ
RD612A
TRACED
TRACE CK.
APP'D.
of guardrail
4'-0" from face
of guardrail
4'-0" from face
flatter
4:1 or
flatter
3:1 or
flatter
3:1 or fl
atter
3:1 or
TerminalEnd
Terminal
End
TerminalEnd
Terminal
End
Terminal
End
section, including the thrie-beam transition, is 12'-6"
The minimum length of w-beam guardrail required between the guardrail end terminal and any transition
7
(FLEAT or SRT) End Terminal
(FLEAT or SRT) End Terminal
(FLEAT or SRT) End Terminal
(FLEAT or SRT) End Terminal
End Terminal
(FLEAT or SRT)
(FLEAT or SRT) End Terminal End Terminal
(FLEAT or SRT)
SCOTT W. KING
for details and general note.
Thrie Beam Transition. See KDOT's 'Thrie Beam Guardrail Transition Details' Standard Drawings
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7-2-09
5-15-17 Removed X-LITE A.L.R. S.W.K.
slope of bridge berm.
See bridge plans for
guardrail
4'-0" from face of
of guardrail
4'-0" from face
free of fixed objects
This area to be maintained
varies
Slo
pe
flatter
3:1 or
flatter
4:1 or
flatter
3:1 or
variable
4:1 or
var.
Slo
pe
THRIE BEAM TRANSITION - TWO LANES325.16'
375.14'
225.23'
375.55'
350.59'
275.76'
250.83'
262.70'
300.17'300.69'
200.26'201.04'
60
70
50
55
45
40 8:1
DESIGN PARAMETERS
(mph)SpeedDesign
(a:b)RateFlare
(R)Radius
(2a:b)RateFlare
(R)Radius
15:1
14:1
12:1
11:1
10:1
30:1
26:1
24:1
21:1
18:1
16:1
variable
4:1 or
ALTERNATE TREATMENT - TWO LANES (Flare Rate = 2a:b)
10:1 Slope
3:1 or flatter
flatter
4:1 or
var.
4:1 or
varies
Slo
pe
Use Type II Terminal
Guardrail on shoulder line as needed.
THRIE BEAM TRANSITION - FOUR LANES (DIVIDED)
Type II T
erm.
Sta. of
Begin
need.
for calculated length of
of Guardrail upstream
Install appropriate length
Type II T
erm.
Sta. of
Begin
reduced by length "D".
only, total length of need may be
jacent traffic in one direction
On divided facility with ad-
FHWA APPROVAL
DESIGNED
DETAILED
DESIGN CK. DETAIL CK. QUAN.CK.
RD
TRACED
TRACE CK.
QUANTITIES
APP'D.
rd612a.d
gn
File :
Dra
wn B
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Plotted :18-J
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STATE
KANSAS
YEARPROJECT N0.SHEETS
TOTALSHEET NO.
DATE REVISIONS BY APP'DNO.
KANSAS DEPARTMENT OF TRANSPORTATION
TYPICAL ALIGNMENTS (FLARED)
BRIDGE APPROACH TRANSITION
THRIE BEAM GUARDRAIL
See KDOT's 'Guardrail Auxiliary Details' Standard Drawing.
Removed Flare-beyond-the-Flare
quantities.
this s
heet
when the flare
d g
uardrail d
esig
n is selecte
d. Inclu
de m
aterial for asphalt g
uardrail wid
enin
g in the pla
n
L = 4
3.7
5' for flare rate of a:b a
nd L = 3
7.5' for flare rate of 2 a:b for a typical installation as s
ho
wn o
n this s
heet. Use
usin
gRoadsid
e D
esig
n G
uid
eN
ote to D
esig
ner: D
etermined g
uardrail length of need in accord
ance with the A
AS
HT
O
6-5-18
6-19-18
KD
OT G
raphics C
ertified
KDOT Graphics Certified 07-18-2018