TditilTraditional ItIntersec tion vs. Split Intersection Split intersection divides one of the intersecting streets into 2 one‐way roads 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 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 itintersecti on split itinto 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 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 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 street 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 & Bridge/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, pedidestrians 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.