Contents 1 History 2 Usage 2.1 Australia 2.2 China 2.3 Germany 2.4 Mexico 2.5 United Kingdom 2.6 United States 3 Operational details 4 Case studies 5 Parallel-flow intersection 6 See also 7 References 8 External links

History[edit] A fly-over designed CFI interchange (separated grade) was invented by Francisco Mier. An intersection (at-grade) variant followed. Over 40 have been implemented since 2000. Mier patented his design, requiring a fee to obtain a license to the design.[1] The patent expired in the United States on 15 October 2003.[2] This general configuration has appeared in different versions in various places, with the implementation of channelization in the United States since the 1950s, such as the Telegraph Road section of U.S. Route 24 in Michigan at Plymouth Road in Redford Charter Township, Michigan.[3] Map all coordinates using: OpenStreetMap · Google Maps Download coordinates as: KML · GPX

Usage[edit] Australia[edit] Hoddle Street, a major north/south arterial road near Melbourne’s Central Business District (known as the “Hoddle Grid”) has suffered major congestion for several years. The state of Victoria announced in their budget for 2016/7 that several intersections will be converted to continuous flow intersections.[4] China[edit] Intersection of Caitian Road and Fuhua Road in Futian, Shenzhen. In operation since 7 October 2017. [5] Germany[edit] Single-leg CFI at Eppendorfer Park in Hamburg between Breitenfelder Straße (Bundesstraße 5) and Tarpenbekstraße (Bundesstraße 433), 53°35′25″N 9°58′59″E / 53.590267°N 9.982989°E / 53.590267; 9.982989 Mexico[edit] Between Chapultepec, Puesta del Sol and Av Eloy Cavazos, Guadalupe, Nuevo León, 25°39′43″N 100°15′31″W / 25.661967°N 100.258747°W / 25.661967; -100.258747 Manuel Gómez Morin Bermúdez aund De La Industria, Bermúdez, Juárez Municipality, Chihuahua, 31°42′13″N 106°24′07″W / 31.70368°N 106.401998°W / 31.70368; -106.401998 Paseo de la Reforma / Periférico und Luis Echeverría, Saltillo, Coahuila, 25°25′39″N 100°58′11″W / 25.42739°N 100.969859°W / 25.42739; -100.969859 United Kingdom[edit] On A4311 road, Cricklade Road and Thamesdown Drive in Swindon, opened in 2003,[6] 51°36′04″N 1°46′53″W / 51.601158562°N 1.7812545°W / 51.601158562; -1.7812545 United States[edit] A continuous flow intersection between Maryland Route 210 and Maryland Route 228 in Accokeek, Maryland. Sketch and traffic light sequence of a four-way intersection with displaced left turns on two of the legs. Listed in chronological order: Haddon Township, Audubon and Audubon Park, New Jersey, New Jersey Route 168 at Nicholson Road, is a hybrid one-leg continuous flow intersection that also employs a jughandle.[citation needed] 39°53′39″N 75°05′29″W / 39.894161°N 75.091435°W / 39.894161; -75.091435 Shirley, New York, opened in 1996, at the entrance to Dowling College.[7] 40°49′35″N 72°52′52″W / 40.826443°N 72.881042°W / 40.826443; -72.881042 Accokeek, Maryland, opened in 2000, at the intersection of Routes 210 and 228.[7] This is an example of a CFI-T, which is a T intersection containing one CFI leg. This junction also has characteristics of a continuous green T (or seagull) intersection.[8] While neither of the routes is grade-separated, southbound through traffic on Route 210 is free-flowing. 38°39′51″N 77°01′01″W / 38.664126°N 77.016928°W / 38.664126; -77.016928 Baton Rouge, Louisiana, opened in March 2006, at the intersection of Airline Highway and Siegen Lane.[9] 30°23′56″N 91°03′15″W / 30.398914°N 91.054119°W / 30.398914; -91.054119 Along Utah State Route 154 (Bangerter Highway) at 5400 South (SR-173) in Taylorsville, 40°39′11″N 111°58′53″W / 40.652993°N 111.981339°W / 40.652993; -111.981339 4700 South in Taylorsville and West Valley City, 40°40′03″N 111°58′54″W / 40.667596°N 111.981567°W / 40.667596; -111.981567 4100 South in West Valley City, 40°40′56″N 111°58′54″W / 40.682132°N 111.981626°W / 40.682132; -111.981626 3500 South (SR-171) in West Valley City,[10] opened in September 2007,[11] 40°41′48″N 111°58′51″W / 40.696629°N 111.980869°W / 40.696629; -111.980869 3100 South in West Valley City, 40°42′14″N 111°58′48″W / 40.703918°N 111.980076°W / 40.703918; -111.980076 Fenton, Missouri, opened October 2007,[12] at the intersection of Highway 30 and Summit Drive/Gravois Bluffs Boulevard.[13] 38°30′15″N 90°27′25″W / 38.504276°N 90.456995°W / 38.504276; -90.456995 Miami Township, Montgomery County, Ohio, a two-leg CFI constructed in the spring of 2009, at the intersection of SR 741 and Miamisburg-Springboro Road/Austin Boulevard.[14] 39°35′48″N 84°13′45″W / 39.596709°N 84.229029°W / 39.596709; -84.229029 Salt Lake County, Utah, in October 2009, the Utah Department of Transportation announced plans for five more continuous flow intersections along Bangerter Highway and Redwood Road (SR-68). As of March 11, 2011, four of them were in use.[15] 13400 South and Bangerter Highway in Riverton, 40°30′28″N 111°58′58″W / 40.507803°N 111.982747°W / 40.507803; -111.982747 7000 South and Bangerter Highway in West Jordan, 40°37′26″N 111°58′35″W / 40.623983°N 111.976422°W / 40.623983; -111.976422 6200 South (Bennion Boulevard) and Bangerter Highway in Taylorsville, 40°38′19″N 111°58′36″W / 40.638581°N 111.976637°W / 40.638581; -111.976637 W 5400 S (SR-173) and Redwood Road in Taylorsville, 40°39′11″N 111°56′20″W / 40.653176°N 111.938802°W / 40.653176; -111.938802 6200 South (Bennion Boulevard) and Redwood Road in Taylorsville, 40°38′19″N 111°56′20″W / 40.638574°N 111.938824°W / 40.638574; -111.938824 Natchez, Mississippi, opened January 2010 at the intersection of US 61 and Junkin Drive, designed by ABMB Engineers and constructed by MDOT. 31°31′43″N 91°23′21″W / 31.528599°N 91.389213°W / 31.528599; -91.389213 Lafayette, Louisiana, ground broke January 2010 at the intersection of US 167 (Johnston St.) and Camellia Boulevard. Estimated cost of $3.5 million.[16] 30°11′37″N 92°03′31″W / 30.193744°N 92.058622°W / 30.193744; -92.058622 Loveland, Colorado, ground broke June 2010 at the intersection of US 34 (Eisenhower Boulevard) and Madison Avenue. Estimated cost of $4 million.[17] 40°24′27″N 105°03′32″W / 40.407365°N 105.058764°W / 40.407365; -105.058764 Orem, Utah, opened May 22, 2012 at the intersection of University Parkway and Sandhill Road, as part of the Interstate 15 CORE project.[18] 40°16′30″N 111°42′48″W / 40.275014°N 111.713445°W / 40.275014; -111.713445 Durango, Colorado, at the intersection of US 160 and US 550. Estimated cost of $6.1 million.[19] 37°16′07″N 107°53′06″W / 37.268540°N 107.884992°W / 37.268540; -107.884992 San Marcos, Texas, two CFIs were constructed. One is a single-leg CFI at the intersection of Loop 82 (Aquarena Springs Drive), Interstate 35's southbound frontage road and I-35's southbound-to-northbound Texas U-turn (29°53′35″N 97°54′48″W / 29.893048°N 97.913367°W / 29.893048; -97.913367). The other, a two-leg CFI, is at the intersection of State Highway 80 (Hopkins Street), I-35's frontage roads and I-35's Texas U-turns (29°52′58″N 97°55′19″W / 29.882639°N 97.921915°W / 29.882639; -97.921915). In both intersections, the displaced left turn lanes merge with the Texas U-turn lanes. The estimated cost for both CFIs is $4.7 million.[20] Dawsonville, Georgia, opened May 15, 2017 at the intersection of SR 400 and SR 53. This is a two-leg CFI, estimated by the Georgia Department of Transportation in 2010 to cost about $14 million.[21] 34°21′48″N 84°02′11″W / 34.363385°N 84.036474°W / 34.363385; -84.036474 Anderson Township, Hamilton County, Ohio, two-leg CFI opened May 19, 2017, at the intersection of Beechmont Avenue (State Route 125) and Five Mile Road.[22][23] 39°4′22″N 84°21′7″W / 39.07278°N 84.35194°W / 39.07278; -84.35194 Colorado Springs, Colorado, two-leg CFI opened in December 2017 at the intersection of Woodmen Road and Union Boulevard.[24] 38°55′59″N 104°46′31″W / 38.933079°N 104.775202°W / 38.933079; -104.775202

Operational details[edit] Sample continuous flow intersection implemented for north/south traffic while east/west traffic has a regular left-turn lane Part of the delay at a typical high-volume right-hand drive intersection is to accommodate left-turns; through-traffic must wait for the traffic turning left because it crosses the path of the through traffic. The continuous flow intersection moves the left-turn conflict out of the intersection and synchronizes it with the signal cycle of the intersecting road. In the adjacent diagram, while the left/right traffic flows through the main intersection, the left-turn traffic crosses to the opposite side of the oncoming traffic a few hundred feet away. Doing this removes the crossing conflict. When the north/south through traffic is allowed through the main intersection, the north/south left-turn lanes are also allowed through the intersections as their paths are no longer crossing. All traffic flow is controlled by traffic signals as at a regular intersection. The Louisiana DOTD article on the Baton Rouge CFI includes a particularly informative diagram of that intersection.[9] To reduce confusion regarding the left-turn lane, the left-turn lane and the straight-through lanes are usually separated by a concrete barrier or traffic island. This diagram shows the straight-through lanes offset by one lane through the intersection and are guided by lines painted through the intersection. But this is just a sample configuration; the lanes may be offset by more lanes or none at all. Nonetheless, due to the provision of traffic between two directions of opposing traffic, some motorists tend to maintain an ongoing criticism of the intersection. Additionally, as in the case of the half-CFI in Accokeek, the offset left-turn traffic reenters the main traffic stream via a half-signal, requiring motorists to merge from a stop condition onto the higher-speed mainline. Motorists sometimes cite discomfort due to the speed differential, a known cause of accidents, though conflicts could be reduced through the provision of an adequate acceleration lane and merge area. The Accokeek, MD CFI also has notable inequalities in traffic flow depending upon the direction of travel. This type of intersection can require a significant amount of right-of-way to implement (dependent upon the configuration), which is why the technique is not frequently used in urban areas. However, the amount of right-of-way necessary for construction and final operation is still typically less than that of an interchange. Additionally, as there is no grade separation involved, costs are considerably less than that of an interchange alternative.

Case studies[edit] The redesign of the Redwood Road/6200 South intersection in Taylorsville, Utah cut emissions of carbon dioxide by 19 tons (17 tonnes) per year.[25] Compared to the previous design, the redesign of the Bangerter Highway/3500 South intersection saves ​3 1⁄2 minutes of travel time per vehicle and 800,000 U.S. gallons (3,000,000 liters) of fuel per year, and has 60% fewer accidents nearby; it also cost $20 million to $40 million less in construction costs than a grade-separated alternative.[26]

Parallel-flow intersection[edit] A parallel-flow intersection (PFI) is a variant similar to the CFI, patented in 2006.[27] It arranges the left-turning traffic in a different manner; it is not displaced, instead turning left closer to the intersection onto a parallel roadway, to the left of oncoming traffic.[28] This was first used in Haddon Township and Camden, New Jersey between New Jersey Route 168 and US Highway 130 at 39°54′15″N 75°05′45″W / 39.90412°N 75.095812°W / 39.90412; -75.095812.

See also[edit] Junction (road) Advanced stop line Bowtie Box junction Hook turn Jughandle Michigan left Quadrant roadway intersection Seagull intersection Slip lane Staggered junction Superstreet Texas T Texas U-turn Turnaround (road)

References[edit] ^ Hummer, Joseph E.; Jonathan D. Reid. "Unconventional Left-Turn Alternatives for Urban and Suburban Arterials" (PDF). Transportation Research Board. Archived from the original (PDF) on 30 September 2007. Retrieved 13 June 2007.  ^ United States Patent and Trademark Office, US  5049000 ^ Telegraph Road, Michigan 42°22′17″N 83°16′32″W / 42.371267°N 83.275563°W / 42.371267; -83.275563 ^ ^ ^ Areal photos in Google Earth of 31 December 2002, retrieved 22. July 2015 ^ a b Bruce, Michael G. & Paul W. Gruner (2005-12-28). "Continuous flow intersections". Retrieved 13 June 2007.  ^ Xianfeng Yang and Yang Lu Gang-Len Chang: An Integrated Computer System for Analysis Selection and Evaluation of Unconventional Intersections Report, University Of Maryland and Maryland State Highway Administration, Publication No. MD-11-SP909B4H, March 2011, retrieved 25 march 2015 ^ a b Ruiz de Chavez, Lindsay (2006-03-21). "First 'continuous-flow' intersection in the state opens on Airline today". Louisiana Department of Transportation & Development. Retrieved 13 June 2007.  ^ Utah Department of Transportation. "3500 South & Bangerter Highway CFI (Continuous Flow Intersection)". Utah Department of Transportation. Archived from the original on 18 June 2007. Retrieved 13 June 2007.  ^ Whit Johnson. "Continuous Flow Intersection Opens to Rush Hour Traffic". KSL Newsradio. Retrieved 17 September 2007.  ^ Elisa Crouch. "How do you get through this?". St. Louis Post-Dispatch. Retrieved 31 October 2007. [permanent dead link] ^ Missouri Department of Transportation - St. Louis Area District. "Continuous Flow Intersections". Missouri Department of Transportation - St. Louis Area District. Retrieved 13 June 2007.  ^ "Austin Pike Interchange ODOT". Ohio Department of Transportation-District 7. Archived from the original on 2009-01-02. Retrieved 2009-02-26.  ^ Jed Boal. "UDOT plans Flex Lanes to ease congestion on 5400 South". KSL Newsradio. Retrieved 13 October 2009.  ^ Unknown. "Officials break ground on Camillia/Johnston project". The Advertiser. Retrieved 27 January 2010. [dead link] ^ City of Loveland. "Madison Improvements at US Hwy 34". Cit of Loveland. Archived from the original on 12 September 2010. Retrieved 12 October 2010.  ^ "University Parkway CFI". Archived from the original on 2011-10-29.  ^ US 160/US 550 Durango Continuous Flow Intersection ^ Intersection Improvements to SH 80 and Loop 82 at I-35, Texas State University, retrieved December 30, 2014 ^ [1] ^ "Continuous Flow Intersection". Anderson Township, Hamilton County, Ohio. January 2018. Retrieved March 18, 2018.  ^ Kraemer, Ally (May 8, 2017). "New continuous flow intersection opening May 19 at Beechmont, Five Mile in Anderson Township". WCPO-TV. E. W. Scripps Company. Retrieved March 18, 2018.  ^ "Woodmen Road Corridor CFI Intersection (long version)". City of Colorado Springs. November 29, 2017. Retrieved January 3, 2018.  ^ FHWA: DLT Case Study – Redwood Road at 6200 South in Taylorsville (Utah), published July 31, 2014 ^ FHWA: DLT Case Study – Bangerter Highway in Salt Lake County (Utah), published July 31, 2014 ^ B2 US patent 7135989 B2, Gregory Fife Parsons, "Parallel flow vehicle turn system for traffic intersections", issued 2006-11-14, assigned to Gregory Fife Parsons  ^ Federal Highway Administration: Alternative Intersections/Interchanges: Informational Report (AIIR), Publication Number: FHWA-HRT-09-060, April 2010

External links[edit] Federal Highway Administration, Alternative Intersection Treatments - CFI University of Maryland, ATTAP - Animation of a CFI (QuickTime required). Additional information may be accessed via the links on the left side. Note that due to the relatively recent installation of the CFI in Baton Rouge, West Valley, UT, and Fenton, MO, some images may not show the existing conditions. Deseret News story about CFI KSL News story about CFI U.S. Department of Transportation CFI open in Natchez, MS Seonyeong Cheong, Saed Rahwanji and Gang-Len Chang: Comparison of Three Unconventional Arterial Intersection Designs: CFI, PFI and Upstream Signalized Crossover, ATTAP, University of Maryland, 3 June 2008 DISPLACED LEFT TURN INTERSECTION Informational Guide, Federal Highway Administration, Publication No. FHWA-SA-14-068, August 2014 v t e Streets and roadways Types of road Limited-access Freeway / Motorway Dual carriageway / Divided highway / Expressway Elevated highway By country Australia Brazil China Croatia Czech Republic Germany Greece Hong Kong India Ireland Italy Pakistan Portugal Spain United Kingdom United States Main roads Arterial road Collector road County highway Express-collector setup Farm-to-market road Highway Link road Two-lane expressway 2+1 road 2+2 road Parkway Super two Trunk road Highway systems by country Local roads Alley Backroad Bicycle boulevard Boulevard Country lane Dead end Driveway Frontage road Green lane Main street Primitive road Road Side road Single carriageway Single-track road Street Sunken lane Other terms Channelization Concurrency Detour Hierarchy of roads Private highway Route number Special route Business route Street hierarchy Toll road Road junctions Interchanges (grade-separated) Cloverleaf Diamond Free-flow Directional T Diverging diamond Parclo Raindrop Roundabout Single-point urban (SPUI) Stack Three-level diamond Trumpet Intersections (at-grade) 3-way junction Bowtie Box junction Continuous flow Hook turn Jughandle Michigan left Offset T-intersection Protected intersection Quadrant roadway Right-in/right-out (RIRO) Roundabout Seagull intersection Split intersection Superstreet Texas U-turn Traffic circle Turnaround Surfaces Asphalt concrete Bioasphalt Brick Chipseal Cobblestone Concrete Reinforced concrete Corduroy Crocodile cracking Crushed stone Diamond grinding of pavement Dirt Full depth recycling Glassphalt Gravel Ice Macadam Pavement milling Permeable Plank Rubberized asphalt Sealcoat Sett Stamped asphalt Tarmac Texture Road hazards Aquaplaning Black ice Bleeding Crosswind Dead Man's Curve Expansion joint Fog Ford Hairpin turn Level crossing Manhole cover Oil spill Oversize load Pothole Road debris Road slipperiness Road train Roadkill Rockfall Rut Speed bump Storm drain Washboarding Washout Whiteout Space and time allocation Barrier transfer machine Bicycle lane Climbing lane Complete streets Contraflow lane Contraflow lane reversal High-occupancy toll lane High-occupancy vehicle lane Lane Living street Managed lane Median / Central reservation Motorcycle lane Passing lane Pedestrian crossing Pedestrian zone Refuge island Reversible lane Road diet Road verge Runaway truck ramp Shared space Sidewalk / Pavement Shoulder Street running railway Traffic calming Traffic directionality Traffic island Traffic lanes Traffic signal preemption Unused highway Wide outside lane Woonerf Demarcation Bollard Botts' dots Cable barrier Cat's eye (road) Concrete step barrier Constant-slope barrier Curb F-Shape barrier Guard rail Jersey barrier Kassel kerb Noise barrier Raised pavement marker Road surface marking Rumble strip Traffic barrier Traffic cone Structures Bridge Causeway Overpass / Flyover Underpass / Tunnel Glossary of road transport terms Road types by features Retrieved from "" Categories: Road junction typesHidden categories: All articles with dead external linksArticles with dead external links from September 2017Articles with permanently dead external linksArticles with dead external links from October 2010Lists of coordinatesGeographic coordinate listsArticles with GeoAll articles with unsourced statementsArticles with unsourced statements from December 2014Articles containing video clips

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EnlargeWest Valley City, UtahUtahEnlargeUtah State Route 154Intersection (road)Right- And Left-hand TrafficInterchange (road)Channelization (roads)U.S. Route 24 In MichiganRedford Charter Township, MichiganMelbourne City CentreHoddle GridFutian DistrictHamburgBundesstraße 5Bundesstraße 433Guadalupe, Nuevo LeónJuárez Municipality, ChihuahuaSaltilloCoahuilaA4311 RoadSwindonEnlargeMaryland Route 210Maryland Route 228Accokeek, MarylandEnlargeHaddon Township, New JerseyAudubon, New JerseyAudubon Park, New JerseyNew Jersey Route 168JughandleWikipedia:Citation NeededShirley, New YorkDowling CollegeAccokeek, MarylandMaryland Route 210Maryland Route 228T IntersectionSeagull IntersectionGrade SeparationFree-flow InterchangeBaton Rouge, LouisianaAirline HighwayLouisiana Highway 3246Utah State Route 154Utah State Route 173Taylorsville, UtahWest Valley City, UtahUtah State Route 171Fenton, MissouriMissouri Route 30Miami Township, Montgomery County, OhioOhio State Route 741Salt Lake County, UtahUtah 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