st. louis county’s experience continuous green-t intersections...at-grade t intersections –...
TRANSCRIPT
10
/14
/20
191
Co
ntin
uo
us G
ree
n-T
Inte
rsectio
ns
St. Lo
uis C
ou
nty
’s Ex
pe
rien
ce
Victo
r Lun
d, P
E
St. Lo
uis C
ou
nty, M
inn
eso
ta
Octo
be
r 14
, 20
19
NC
ITE
ITC
C/G
DC
Me
etin
g
Ima
ge
s Sou
rce: St. Lo
uis C
ou
nty
10
/14
/20
19
Sou
rce: D
ulu
th N
ew
s Tribu
ne
, May 1
3, 2
01
71
0/1
4/2
01
9
12
10
/14
/20
192
Inn
ov
ativ
e In
terse
ction
s
•Le
vera
ges ge
om
etry to
…
–Im
pro
ve sa
fety
–R
ed
uce
de
lay
–In
crea
se ca
pa
city
10
/14
/20
19
Inn
ov
ativ
e In
terse
ction
s
•W
ha
t is an
inn
ova
tive in
terse
ction
?
–A
n in
terse
ction
tha
t imp
rove
s traffic flo
w a
nd
safe
ty thro
ug
h n
on
-
trad
ition
al ge
om
etric ch
an
ges
–M
ay inco
rpo
rate
com
po
ne
nts o
f trad
ition
al in
terse
ction
s such
as a
traffic co
ntro
l sign
al syste
m o
r YIE
LD sig
ns
–Typ
ically d
oe
s no
t req
uire
a “w
arra
nt a
na
lysis”
–D
esig
n re
du
ces n
um
be
r an
d se
verity o
f con
flict po
ints
10
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/20
19
34
10
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193
Inn
ov
ativ
e In
terse
ction
s
•W
hy m
igh
t an
Inn
ova
tive In
terse
ction
be
con
side
red
?
–E
xcessive
de
lay an
d/o
r con
gestio
n
–P
oo
r traffic sa
fety p
erfo
rma
nce
–A
ccess m
an
age
me
nt
–U
niq
ue
site sp
ecific ge
om
etric ch
alle
nge
s
–Tra
ditio
na
l inte
rsectio
n n
o lo
nge
r pro
vide
s the
ne
ed
ed
pe
rform
an
ce
Ima
ge
Sou
rce: St. Lo
uis C
ou
nty
10
/14
/20
19
Inn
ov
ativ
e In
terse
ction
s
•Typ
es o
f Inn
ova
tive In
terse
ction
s
–R
ou
nd
ab
ou
ts (inclu
din
g M
inis)
–R
ed
uce
d C
on
flict Inte
rsectio
n (R
CI)
–C
on
tinu
ou
s Gre
en
-T
–D
iverg
ing
Dia
mo
nd
Inte
rcha
nge
(DD
I)
–Ju
gh
an
dle
10
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19
56
10
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194
Th
e N
ee
d
53
%
4%
14
%
26
%
3%
No
t A C
ollisio
n w
ith M
oto
r Ve
hicle
Re
ar E
nd
He
ad
On
An
gle
Oth
er
Sou
rce: Fa
tality A
na
lysis Re
po
rting
System
(FAR
S)
20
17
Min
ne
sota
Fata
l Cra
she
s
10
/14
/20
19
•D
isting
uish
ing
fea
ture
s
–A
n a
t-gra
de
, sign
alize
d T
inte
rsectio
n
–P
rovid
es a
byp
ass fo
r on
e d
irectio
n o
f thro
ug
h tra
ffic sep
ara
ted
by a
ba
rrier
–V
eh
icles tu
rnin
g le
ft from
side
stree
t are
pro
vide
d a
de
dica
ted
acce
lera
tion
lan
e
•C
ost
–$
50
0,0
00
to $
1 m
illion
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nIma
ge
Sou
rce: FH
WA
10
/14
/20
19
78
10
/14
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195
•Typ
ical in
stalla
tion
s
–A
t-gra
de
T in
terse
ction
s
–W
arra
nts m
et fo
r a tra
ffic sign
al
•B
en
efits
–R
ed
uce
s nu
mb
er o
f con
flict po
ints
–R
ed
uce
s de
lay for th
e sid
e stre
et
–O
ffsets th
e in
crea
se in
de
lay on
the
ma
jor stre
et d
ue
a tra
ffic sign
al
–P
ub
lishe
d cra
sh re
du
ction
s of 6
0%
(tota
l crash
es), 7
0%
(inju
ry crash
es)
an
d 9
7%
(an
gle
crash
es) 1
Co
ntin
uo
us G
ree
n T
Inte
rsectio
n
1: FH
WA
Ca
se Stu
dy, FH
WA
-SA-0
9-0
16
10
/14
/20
19
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
•R
ice La
ke R
oa
d (C
SAH
4) a
nd
Airp
ort R
oa
d (city stre
et)
•Se
con
da
ry acce
ss to D
ulu
th In
tern
atio
na
l Airp
ort
•R
ece
ived
fee
db
ack th
at th
e in
terse
ction
wa
s exp
erie
ncin
g sig
nifica
nt d
elay
for ve
hicle
s turn
ing
left fro
m A
irpo
rt Ro
ad
on
to R
ice La
ke R
oa
d d
urin
g th
e
we
ekd
ay pm
pe
ak p
erio
d
10
/14
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19
910
10
/14
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196
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
•E
xisting
con
ditio
ns
•P
M P
ea
k Ho
ur fo
r
Airp
ort R
oa
d
–LO
S F
–9
5th
%ile
Qu
eu
e =
50
0 ft
10
/14
/20
19
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
•A
t-Gra
de
Sign
alize
d
Trum
pe
t
10
/14
/20
19
11
12
10
/14
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197
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
•A
t-Gra
de
Offse
t Trum
pe
t
10
/14
/20
19
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
10
/14
/20
19
13
14
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/14
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198
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
10
/14
/20
19
•C
on
tinu
ou
s Gre
en
T o
pe
ne
d to
traffic o
n O
ctob
er 2
01
6
•M
axim
um
ob
serve
d tra
ffic qu
eu
e <
10
veh
icles
•N
o kn
ow
n m
ulti-ve
hicle
crash
es
•G
oo
d p
ub
lic resp
on
se
Ima
ge
Sou
rce: St. Lo
uis C
ou
nty
Co
ntin
uo
us G
ree
n T
Inte
rsectio
nS
t. Lou
is Co
un
ty E
xp
erie
nce
10
/14
/20
19
15
16
10
/14
/20
199
•In
no
vative
inte
rsectio
ns ge
ne
rally a
dd
ress th
e ro
ot ca
use
of
serio
us cra
she
s at in
terse
ction
s –rig
ht a
ng
le co
nflict p
oin
ts
•C
ost ca
n b
e le
ss tha
n tra
ditio
na
l de
sign
s (i.e. g
rad
e se
pa
rate
d
inte
rcha
nge
); wh
ere
cost is g
rea
ter, co
nsid
er th
e a
dd
ition
al
be
ne
fits ach
ieve
d (b
en
efit vs. co
st)
•D
o yo
ur h
om
ew
ork; d
on
’t rely o
n “ca
nn
ed
” state
me
nts b
ut
rath
er u
se site
spe
cific refe
ren
ces a
s a b
asis fo
r sup
po
rt
•A
s with
all stra
teg
ies, n
on
e a
re “silve
r bu
llets”; th
is is wh
y we
have
“en
gin
ee
ring
jud
gm
en
t”
Co
nclu
sion
s
10
/14
/20
19
•FH
WA
Safe
ty Office
–h
ttps://sa
fety.fh
wa
.do
t.gov/in
terse
ction
/
•FH
WA
Pro
ven
Safe
ty Co
un
term
ea
sure
s
–h
ttps://sa
fety.fh
wa
.do
t.gov/p
rove
nco
un
term
ea
sure
s/
•M
inn
eso
ta D
ep
artm
en
t of Tra
nsp
orta
tion
, Re
du
ced
Co
nflict
Inte
rsectio
ns
–h
ttp://w
ww
.do
t.state
.mn
.us/ro
ad
wo
rk/rci/
•FH
WA
Co
ntin
uo
us G
ree
n T
Inte
rsectio
ns
–h
ttps://sa
fety.fh
wa
.do
t.gov/in
terse
ction
/inn
ova
tive/o
the
rs/case
stud
ie
s/fhw
asa
09
01
6/
Re
sou
rces
10
/14
/20
19
17
18
10
/14
/20
19
10
Qu
estio
ns
Victo
r Lun
d, P
E
Traffic E
ng
ine
er
St. Lou
is Co
un
ty, Min
ne
sota
Ph
on
e: 2
18
-62
5-3
87
3
Em
ail: lu
nd
v@stlo
uisco
un
tymn
.gov
10
/14
/20
19
4
US-5
3 a
nd
CSA
H 7
Traffic V
olu
me
Ma
pM
on
day, M
ay 23
, 20
16
10
/14
/20
19
19
20
10
/14
/20
19
11
•T
he
ave
rage
time
for th
e sid
e
stree
t to cro
ss US-5
3 d
urin
g lo
w
volu
me
con
ditio
ns is…
–3
6 se
con
ds fo
r a tra
ditio
na
l
divid
ed
hig
hw
ay in
terse
ction
(red
do
tted
line
)
–6
7 se
con
ds fo
r a J-Tu
rn
inte
rsectio
n (ye
llow
do
tted
line
)*
•A
J-Turn
ad
ds a
n a
vera
ge o
f 30
seco
nd
s to th
e th
rou
gh
mo
vem
en
t
Co
tton
, MN
*N
ote
: Tim
e fo
r crossin
g w
as m
ea
sure
d w
he
re
U-Tu
rns w
he
re p
lace
d a
t 1,3
00
Fee
t from
the
inte
rsectio
n.
Re
du
ced
Co
nflict In
terse
ction
(RC
I)
10
/14
/20
19
Ch
isho
lm R
ou
nd
ab
ou
t
MN
TH
-73
at C
SA
H 5
10
/14
/20
19
21
22
10
/14
/20
191
Hig
hw
ay 6
1
No
rth Sh
ore
of La
ke Su
pe
rior
FH
WA
Min
ne
sota
Divisio
n
Co
ntin
uo
us G
ree
n T
Inte
rsectio
ns
Octo
be
r 14
, 20
19
WILL
ST
EIN
Sa
fety
& D
esig
n E
ng
ine
er2
Du
luth
Bra
ha
m
Mo
ntro
se
Prio
r Lak
e
12
10
/14
/20
192
FH
WA
Min
ne
sota
Div
ision
3
•U
S 1
2 a
nd
Mn
25
, ne
ar M
on
trose
–O
ctob
er 2
01
5
•S
t. Lou
is Co
un
ty R
oa
d 4
/Rice
Lake
Ro
ad
an
d
Airp
ort R
oa
d, D
ulu
th–
Octo
be
r 20
16
•M
ystic La
ke D
rive a
nd
Da
kota
hP
ark
wa
y, Prio
r La
ke–
Fall 2
01
7
•M
n6
5 a
nd
Mn
10
7, n
ea
r Bra
ha
m–
July
20
19
4 C
on
tinu
ou
s Gre
en
T’s
in M
inn
eso
ta
4
34
10
/14
/20
193
FH
WA
Min
ne
sota
Div
ision
5
No
n-m
oto
rized
use
rs
•W
ill’s op
inio
n:
–A
void
con
tinu
ou
s Gre
en
T’s in
urb
an
/sub
urb
an
are
as
wh
ere
pe
de
strian
or b
ike fa
cilities cro
ss the
ma
jor
roa
d.
FH
WA
Min
ne
sota
Div
ision
6
Wh
at a
bo
ut in
trod
ucin
g iso
late
d
sign
als o
n ru
ral h
igh
wa
ys?
•Jim
McC
arth
y:
–O
ne
of th
e first cra
sh ty
pe
s tha
t ad
van
ced
veh
icles w
ill b
e a
ble
to p
reve
nt is th
e re
ar-e
nd
crash
.
–A
uto
ma
tic bra
kin
g.
–V
eh
icles d
on
’t ne
ed
to b
e co
nn
ecte
d.
•P
reve
ntin
g rig
ht-a
ng
le cra
she
s is mo
re
difficu
lt.–
ne
ed
veh
icle to
veh
icle co
mm
un
icatio
n.
–w
ill be
furth
er in
to th
e fu
ture
.
56
10
/14
/20
194
FH
WA
Min
ne
sota
Div
ision
7
US
12
an
d M
nH
igh
wa
y 2
5
(ne
ar M
on
trose
)
FH
WA
Min
ne
sota
Div
ision
8
Tra
ffic vo
lum
es
78
10
/14
/20
195
FH
WA
Min
ne
sota
Div
ision
9
•Fa
tal rig
ht-a
ng
le cra
sh (2
00
4)
•S
erio
us in
jury
righ
t-an
gle
crash
(20
05
)
•A
ll seve
rities: a
bo
ut 2
crash
es p
er ye
ar.
Se
ve
re cra
she
s –b
efo
re
FH
WA
Min
ne
sota
Div
ision
10
•Tw
o m
ino
r crash
es.
–O
ne
we
ath
er-re
late
d ro
ad
de
pa
rture
.
–O
ne
rea
r-en
d.
Cra
she
s –p
ost co
nstru
ction
910
10
/14
/20
196
FH
WA
Min
ne
sota
Div
ision
11
•C
on
tinu
ou
s Gre
en
T
•S
tan
da
rd sig
na
l
•N
on
-sign
alize
d G
ree
n T
•ro
un
da
bo
ut
Inte
rsectio
n ty
pe
s con
side
red
FH
WA
Min
ne
sota
Div
ision
12
Up
com
ing
US
12
pro
ject
11
12
10
/14
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197
13
Mn
Hig
hw
ay
65
an
d M
nH
igh
wa
y 1
07
(ne
ar B
rah
am
)
14
13
14
10
/14
/20
198
FH
WA
Min
ne
sota
Div
ision
15
Mn
Hig
hw
ay
65
an
d M
nH
igh
wa
y 1
07
(ne
ar B
rah
am
)
FH
WA
Min
ne
sota
Div
ision
16
ho
rizon
tal a
nd
ve
rtical
curv
atu
re
15
16
10
/14
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199
FH
WA
Min
ne
sota
Div
ision
17
4 fa
tal cra
she
s (6 fa
talitie
s)
FH
WA
Min
ne
sota
Div
ision
18
17
18
10
/14
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19
10
FH
WA
Min
ne
sota
Div
ision
19
FH
WA
Min
ne
sota
Div
ision
20
19
20
10
/14
/20
19
11
21
22
21
22
10
/14
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19
12
23
FH
WA
Min
ne
sota
Div
ision
24
•C
on
tinu
ou
s Gre
en
T
•R
ed
uce
d C
on
flict Inte
rsectio
n
•ro
un
da
bo
ut
Inte
rsectio
n ty
pe
s con
side
red
23
24
10
/14
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19
13
25
26
25
26
10
/14
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19
14
27
28
27
28
10
/14
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19
15
29
30
29
30
10
/14
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19
16
31
FH
WA
Min
ne
sota
Div
ision
32
Min
i-rou
nd
ab
ou
ts an
d se
vera
l oth
er le
ss
com
mo
n in
terse
ction
typ
es h
ave
be
en
pro
ven
in
Min
ne
sota
an
d sh
ou
ld n
o lo
ng
er b
e v
iew
ed
as
“alte
rna
tive” o
r “inn
ova
tive”. R
ath
er, th
ey
sho
uld
be
vie
we
d a
s stan
da
rd d
esig
ns th
at a
re a
rou
tine
pa
rt of in
terse
ction
con
trol e
valu
atio
n.
Fro
m IT
E Jo
urn
al
31
32
10/14/20191
CS
AH
83
/Da
ko
tah
Pa
rkw
ay
Sh
ak
op
ee
Md
ew
ak
an
ton
Sio
ux
Co
mm
un
ity
NC
ITE
Tra
ffic Co
ntro
l an
d G
eo
me
tric Co
mm
ittee
s
10
/14
/19
12
10/14/20192
Tra
nsp
orta
tion
Co
nte
xt
•8
0%
of C
asin
o T
raffic C
om
es
from
the
No
rth
•1
7,0
00
Ve
hicle
s pe
r Da
y N
orth
o
f Ca
sino
(~9
0%
of tra
ffic g
en
era
ted
by
My
stic Lak
e o
r Little
Six)
•P
roje
ct exp
an
de
d C
SA
H 8
3 to
4
-lan
e th
rou
gh
en
tire a
rea
•C
asin
o C
am
pu
s Eve
nt T
raffic
Ha
s Stro
ng
Pe
ak
ing
C
ha
racte
ristics
•H
ote
l exp
an
sion
•E
ven
t cen
ter co
nstru
ction
(d
esire
for d
irect a
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