Traditional Intersections vs. Town Center Intersections
Similar to Split Intersection ‐ roads are split into 1‐way streets and space in center developed or preserved
Traditional Intersection
Traditional iiintersection signal cycle has 4 phases –
2 for left turns
2 for through movements Traditional Intersection
4 Phase Signal Cycle Times*
10% 6%
22% 62% lefts straight through
*average intersection
75% of the traffic (through movement) gets only about 60% of the cycle time Too much time spent on left turns and yellow signals (transition between movements)
Innovative Intersection
Innovative intersection signal cycles have only 2 (or 3) phases – left turns are moved or redirected Innovative Intersections create more green time 4 Phase Signal ItiInnovative 2 Phase Cycle Times Signal Cycle Times 6% 4% 10% 6%
22% 62% 90% lefts straight straight through through
75% ‐ 80% of traffic 100% of traffic gets 90% of time – gets only about 60% of time no waiting for left turns
Town Center Intersection A town center split intersection, intersection (tci) but both streets is similar to the are separated
FUTURE USE open or developed “Town Center” available
FUTURE USE for public open or developed
into 1‐way ora private 4 simple uses. streets, creating d intersections Assist Town Center Intersection A town center split intersection, intersection (tci) but both streets is similar to the are separated
FUTURE USE open or developed “Town Center” available
FUTURE USE for public open or developed
into 1‐way ora private 4 simple uses. streets, creating d intersections Assist
Town Center Intersection A town center split intersection, intersection (tci) but both streets is similar to the are separated
FUTURE USE open or developed “Town Center” available
FUTURE USE for public open or developed
into 1‐way ora private 4 simple uses. streets, creating d intersections Assist Town Center Intersections: for Transit Oriented Mixed Use Centers o replaces one 4‐phase signal with four 2‐phase signals o narrower streets good for TOD, pedestrians o quality space in center
TCI Development Continues
School Residential
Public Square
LkLake San Marcos, CA TCIs at Daybreak Development
Developing on west bhbench of Salt Lake Valley by Kennecott
Town Center Intersection
Highway into South Padre Island
Visitors first iiimpression of the community is not a traffic signal, but a landscaped Town Center Intersection
South Padre Island, TX TCI at Denver’s Stapelton Redevelopment
th TCI at DenverDowntown’s 16 DenverStreet Mall Downtown Denver
16th Street Branded Shuttle carries over 50,000 passengers per day
The TCI “Triplet” makes 16th Street possible TCI at Denver’s 16th Street Mall
16th street mall, ped/transit zone
TCI Downtown Boise
Potential for TCI development?
Quality Space in center for Pedestrians
Market Grove Bo‐Do TCI System Downtown Spokane
Moscow, ID
← pullman original layout 3rd st/hwy 8 grid system aligned n/s (not with railroad)
us 95 served as main street → 5 9
st/us heavy truck traffic conflicts
with retail and on‐street parking main ←
3rd st/hwy 8 connects moscow & pullman u of idaho Assist calming Split preserving One
of of
s the the
iili m 6 Flow us ‐
il
Town maintain points worst worst downtown downtown
ar 95 and to
app
through town ako & jackson
streetscape intersections intersections at li iti li ca
on Burnside, ti
‐ on
street Center traffic center Portland,
washington i i n
–
t ti
on w
parking routed Sandy
in in i n
main
otads Portland Portland f fll a ll
s and
Intersection
12 ← ’ s pullman
u th urban urban 3
of of . rd OR
st/hwy idaho
area area
8
– ← jacksonst
←us 95 ← main st → us 95 →
washington st → Town Center Intersection Portland, OR
One of the worst intersections in Portland’ s urban area – 6‐points at Burnside, Sandy and 12th.
Solution – Vacate a portion of 13th and Sandy Create one‐way couplet with Burnside and Couch Route traffic around new town center
Town Center Intersection Portland, OR
One of the worst intersections in Portland’ s urban area – 6‐points at Burnside, Sandy and 12th.
Solution – Vacate a portion of 13th and Sandy Create one‐way couplet with Burnside and Couch Route traffic around new town center Town Center Intersections Can be applied to new developments or in existing downtowns or neighborhoods with traditional grid street pattern Narrower streets good for TOD, peddiestrians Quality space in center
Thank You
For more information, visit compassidaho.org Air photos source: Google Earth and Bing Maps