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8/20/2019 Roundabout Design Parameters
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TYPES OF ROUNDABOUT
1. MINI ROUNDABOUT
2. COMPACT ROUNDABOUT
3. NORMAL ROUNDABOUT
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DESIGN PARAMETERS: M+n+m'm ICD 0 2) m En#r" C'r( Ra+'!0 14 m M+n+m'm E/+# C'r( Ra+'!0 1- m #o 24 m En#r"5E/+# %+#6 ,.- m
En#r" Angle0 24 #o 4 egreeO7#+m'm 34*,- En#r" Pa#6 Ra+'!0 Ma/ 84 m Flare Leng#6 0 -.4 m m+n+m'm
COMPACTROUNDABOUT
KEY FEATURES: S+ngle lane En#r+e! 9 E/+# on all
leg!. M+nor collec#or: !er&+ce:Local Roa! Ra+!e +!lan %+#6 Tr'c; a7ron
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T<O * LANE ROUNDABOUT
KEY FEATURES: Ma=or an M+nor collec#or: local Ra+!e +!lan %+#6 Tr'c; a7ron Flare En#r+e! an e/+#!: allo%+ng #%o &e6+cle #o
en#er 5E/+# T%o lane on all en#r+e! No more #6an #%o E/+# Lane
>>Circulatory Roadway Width : !" to !# $ Ma%!
E&try Width
DESIGN PARAMETERS: M+n+m'm ICD 0 2) m C+rc'la#or" roa%a" 0 #o 14 m En#r" C'r( Ra+'!0 14 m M+n+m'm E/+# C'r( Ra+'!0 24*144 m M+n+m'm
En#r" Angle0 24 #o 4 egreeO7#+m'm 34*,-
En#r" Pa#6 Ra+'!0 Ma/ 144 m
E%it Width : '(DM )!"!* S+ngle lane 0 8.4 m #o 8.- m %+e
S+ngle E/+# D'al Lane 0 14 #o 11 m<+e #%o
lane Ta7er 0 101- #o 1024
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En#r" <+#6 9 Flare Leng#6
• E+,ti-, Flar, .,&/th:• A-,ra/, l,&/th o-,r which th, ,&try
wid,&0!
• Mi&i1u1 21 i& ur3a& Ar,a
• #2 1 i& Rural Ar,a
44 E+,cti-, 5ar, l,&/th /r,at,r tha& #2 1 1ayi16ro-, th, /,o1,tric layout 3ut littl,,+,ct o& Ca6acity
AJ
DC
B
F'
GV
H
V=Approach Half Width
HALF WIDTH (V)
C A P A C I T
C A P A C I T
!"T# WIDTH
$ % & ' * + , * + , - %$ %%
%$$$
%&$$
%$$
%*$$
%,$$ %$$
%&$$
%$$$
,$$
*$$
C A P A C I T
FLA#!L!"GTH
$ %$ &$ $ ($ )$ *$ +$ ,$
*$$
,$$
%$$$
%&$$
%($$
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En#r" Angle
A&/l, 3,tw,,& E&t,ri&/ a&d
Circulati&/ Tra7c 0tr,a10! A&/l, 0hould li, 3,tw,,& #"
a&d )" d,/r,, 8o6ti1u1 *"92 d,/r,,;
C A P A C I T
!"T#A"GL!
$ &$ ($ *$ ,$ %$$
%($$
%&$$
%$$$
,$$
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En#r" Pa#6 Ra+'!
E&try Path Radiu0 M+n+ Ro'na(o'#0 No ma/ &al'e Com7ac# Ro'na(o'#0 Ma/ 84 m T%o lane Ro'na(o'#0 Ma/ 144 m
