TditilTraditional ItIntersecti on vs. Split

Split intersection divides one of the intersecting into 2 one‐way

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 (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

Split Intersections

A split intersection divides into 2 one‐way roads – one of the intersecting creating two simpler streets… intersections

This one FUTURE USE still has left (open space) but some turns in the center ‐ have no lefts in center Split Intersection Busy iitntersecti on split iitnto 2 iitntersecti ons – now works on 2 signal phases instead of 4

Land uses remain intact

Can use existing streets and driveways Golden Triangle, NJ

Split Intersection

Through movements on

Left turns maneuver Signal Phase 1 around block

Golden Triangle, NJ Split Intersection

Signal Phase 2

Can accommodate all movements on cross streets Golden Triangle, NJ

Split Intersection

Through movements on highway

Left turns maneuver Signal Phase 1 around block

Golden Triangle, NJ Split Intersection

Signal Phase 2

Can accommodate all movements on cross streets Golden Triangle, NJ

Split Intersection Example: Blackfoot, ID

↖ to I‐15

Bridge and Judicial Streets ↗ Couplet creates turned into 1‐way couplet split intersection ← with Main St

Assist Split Intersection Example: Waco, TX

Assist

Split Intersection Example: Waco, TX

Assist Split Intersection Example: Waco, TX

Assist

Split Intersection

Here are some examples of split intersection locations: o Burlington, NJ – Burlington Pike & High St o Golden Triangle, NJ –Crescent Blvd & Marlton Pike o Pennsauken, NJ –US 130 & Westfield/Camden Turnpike o Waco, TX – New Dallas Hwy & Industrial Blvd

See also: o Blackfoot, ID –Main St & /Judicial o Moscow, ID – Jackson/Washington & 3rd St

Assist Town Center Intersection A town center split intersection, intersection (tci) but both streets is similar to the are separated

FUTURE USE FUTURE USE (open space) (open space)

into 1‐way a 4 simple

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 Split Intersections Can be applied to new developments or in existing downtowns or neighborhoods with traditional grid street pattern Narrower streets good for TOD, peddiestrians Can use quality space in center or leave as open space

Thank You

For more information, visit compassidaho.org Air photos source: Google Earth and Bing Maps