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57-480: State Route 141 ( SR 141 ) is a 34.1-mile-long (54.9 km) state highway that runs southwest-to-northeast in the northwest part of the U.S. state of Georgia . It connects the Buckhead area of Atlanta with Cumming . Its routing exists within portions of Fulton , DeKalb , Gwinnett , Forsyth counties . SR 141 begins at an intersection with US 19 / SR 9 (Roswell Road NE) in

114-538: A frontage road parallel to SR 141/Peachtree Industrial Boulevard. After the split of SR 141 and Peachtree Industrial Boulevard, SR 141 Conn. merges with Peachtree Industrial Boulevard. The route then turns left onto Holcomb Bridge Road and ends at the intersection of Holcomb Bridge Road and SR 141. The route connects traffic from SR 140 to SR 141 north, since there is no direct entrance ramp between these two roads. SR 141 Conn. south does not exist because traffic can exit from SR 141 south directly to SR 140. The entire route

171-412: A single-point interchange ( SPI ) or single-point diamond interchange ( SPDI ), is a type of highway interchange . The design was created in order to help move large volumes of traffic through limited amounts of space efficiently. A SPUI is similar in form to a diamond interchange but has the advantage of allowing opposing left turns to proceed simultaneously by compressing the two intersections of

228-545: A SPUI allows only left and right turns, drivers may not reenter the freeway they are departing (if, for example, they realize that they have taken the wrong exit) within a SPUI. Three-phase traffic signals are required. Other interchange types designed for efficiency, such as the six-ramp partial cloverleaf and the diverging diamond , require just two signal phases. The first SPUI opened on February 25, 1974, along U.S. Route 19 ( State Road 55 ), which goes over State Road 60 east of Clearwater, Florida . It

285-458: A SPUI. A freeway-over SPUI (as in the lower photo) requires a longer bridge of the free-flowing road to cross the wider area required for the SPUI intersection below. Because vehicles must be able to cross the pavement in six different ways, a SPUI generally has a very large area of uncontrolled pavement in the middle of the intersection. This can be unsafe particularly if drivers are unfamiliar with

342-536: A continuous green T-intersection with the bridges. The ramps cross each other at-grade , with a traffic light -controlled intersection. An interchange, like that in Millvale, Pennsylvania, formerly existed at the junction of SR 7 and SR 822 at the now-demolished Fort Steuben Bridge in Steubenville, Ohio . The northbound carriageway of SR 7 passed under the bridge, with lefthand ramps meeting

399-404: A diamond into one single intersection over or under the free-flowing road. The term "single-point" refers to the fact that all through traffic on the arterial street, as well as the traffic turning left onto or off the interchange, can be controlled from a single set of traffic signals . Due to the space efficiency of SPUIs relative to the volume of traffic they can handle, the interchange design

456-484: A named route branch) Trans-Canada route marker is co-signed with a numbered provincial sign, with the provincial route often continuing alone outside the Trans-Canada Highway section. However, in the western provinces, the two parallel Trans-Canada routes are consistently numbered with Trans-Canada route markers; as Highways 1 and 16 respectively. Canada also has a designated National Highway System , but

513-530: A population of at least 10,000 inhabitants are urban roads (type D and E) under the jurisdiction of the relevant municipalities. The state highway that cross towns or villages with a population of less than 10,000 inhabitants are urban roads (type D and E) under the jurisdiction of the municipality, subject to authorization from ANAS . State highways in India are numbered highways that are laid and maintained by state governments . Mexico 's State Highway System

570-430: A significant difference between the two types of interchanges in terms of total collisions, the injury and fatality rates are notably lower for SPUIs than diamond interchanges. The major disadvantage of SPUIs over other types of road junctions is the increased cost due to the need for a longer or wider bridge. A freeway-under SPUI (as in the upper diagram) requires a wider bridge over the free-flowing road to make room for

627-623: A single signal, vehicles can clear the intersection much more quickly than in a diamond interchange (which requires two sets of traffic signals). SPUIs also allow for wider turns, easing movement for large vehicles, such as trucks and RVs. Furthermore, a SPUI takes up considerably less space than a full cloverleaf interchange , allowing construction to take place on a limited amount of property and minimizing state use of eminent domain . Finally, SPUIs are reportedly safer than other space-efficient interchange forms, such as (standard) diamond interchanges. Research suggests that, although there may not be

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684-414: A snowplow leave piles of snow, interfering with traffic and visibility in the middle of the uncontrolled pavement. Additionally, if the wide area of uncontrolled pavement is on a bridge, as in the diagram, the snow cannot be pushed to the sides of the bridge as it may pose a hazard to the road underneath. This problem can be exacerbated by the comparatively large bridge width required by the SPUI. Given that

741-423: A surface intersection. The most commonly cited advantages of SPUIs are improved operation efficiency and safety as well as reduced right-of-way requirements compared to other interchange forms. Left-turning traffic from both directions of the intersecting roadways is able to turn simultaneously without crossing the path of the opposing left turns. Because traffic passing through the interchange can be controlled by

798-617: A three-digit number designation, preceded by D . Provincial roads ( Turkish : İl yolu ) are secondary roads, maintained by respective local governments with the support of the KGM. The roads have a four-digit numbering grouped as two pairs, pairs are separated by a dash. First pair represents the license number of that province . State highways are generally a mixture of primary and secondary roads, although some are freeways (for example, State Route 99 in California, which links many of

855-750: Is 100 km/h, with reductions when one passes through a densely populated area. The highways in New Zealand are all state highways, and the network consists of SH 1 running the length of both main islands, SH 2–5 and 10–58 in the North Island, and SH 6–8 and 60–99 in the South Island. National and provincial highways are numbered approximately north to south. State Highway 1 runs the length of both islands. Local highways ( Korean :  지방도 ; Hanja :  地方道 ; RR :  Jibangdo ; MR :  Chipangdo ) are

912-402: Is a 0.9-mile-long (1.4 km) connecting route of SR 141 that exists entirely within the Buckhead section of Atlanta , in eastern Fulton County . It is known as Lenox Road NE , as well as Paul Coverdell Memorial Parkway, for its entire length. It was built in the early 1990s in conjunction with SR 400 to serve area businesses and offices. It begins at an intersection with

969-450: Is a multi-use trail under construction along Peachtree Industrial Boulevard. There are six road segments that previously carried State Route 141 or a derivative designation that no longer do. State highway (US) Roads maintained by a state or province include both nationally numbered highways and un-numbered state highways. Depending on the state, "state highway" may be used for one meaning and "state road" or "state route" for

1026-490: Is a system of urban and state routes constructed and maintained by each Mexican state. The main purpose of the state networks is to serve as a feeder system to the federal highway system. All states except the Federal District operate a road network. Each state marks these routes with a white shield containing the abbreviated name of the state plus the route number. New Zealand state highways are national highways –

1083-897: Is also a SPUI on the Frankenschnellweg , the urban part of the A73 , and Maximilianstraße, in Nuremberg (at 49°27′06″N 11°02′17″E  /  49.451708°N 11.038102°E  / 49.451708; 11.038102 ). Smaller versions of the SPUI can also be found on non-autobahn roads in German cities, with right-turning traffic under signal control, located in Heilbronn , Karlsruhe , Sindelfingen , Stuttgart , and Wiesbaden . SPUIs are also found in Australia, Canada, Hong Kong, Indonesia, and Singapore. A rarely built variant of

1140-424: Is divided into provinces and territories, each of which maintains its own system of provincial or territorial highways, which form the majority of the country's highway network. There is also the national transcontinental Trans-Canada Highway system, which is marked by distinct signs, but has no uniform numeric designation across the country. In the eastern provinces, for instance, an unnumbered (though sometimes with

1197-433: Is expected unless fairly substantial changes to the design or special accommodations are provided. Pedestrians are usually not able to get through the intersection with one green light. It can take up to four cycles to walk through the entire length of a SPUI. Finally, SPUIs can be somewhat difficult to clear of snow. The large area in which lanes cross may have to be shut down to allow efficient and thorough cleaning lest

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1254-431: Is free to choose a different marker, and most states have. States may choose a design theme relevant to its state (such as an outline of the state itself) to distinguish state route markers from interstate, county, or municipal route markers. Single-point urban interchange A single-point urban interchange ( SPUI , / ˈ s p uː i / SPOO -ee or / ˈ s p juː i / SPEW -ee ), also called

1311-711: Is in Peachtree Corners , Gwinnett County . Peachtree Industrial Boulevard is a road in the U.S. state of Georgia that begins in Chamblee and ends in Buford . Between Interstate 285 and SR 140 (Jimmy Carter Boulevard), the road is concurrent with SR 141. North of SR 140, in Peachtree Corners, Peachtree Industrial Boulevard splits from SR 141 and continues to the northeast as a highway with at least four lanes and center median, traveling through

1368-568: Is not a road class. The Strade Statali , abbreviated SS, is the Italian national network of state highways. The total length for the network is about 25.000 km (15.534 mi). The Italian state highway network are maintained by ANAS . From 1928 until 1946 state highways were maintained by Azienda Autonoma Statale della Strada (AASS). The next level of roads below Strada Statali is Strada Regionale ("regional roads"). The routes of some state highways derive from ancient Roman roads , such as

1425-620: Is not part of the National Highway System , a system of roadways important to the nation's economy, defense, and mobility. The entire route is in Atlanta , Fulton County . State Route 141 Connector (SR 141 Conn.) is a .8 mile long (1.3 km) connecting route of SR 141 that exists entirely within Gwinnett County . It is just west of Norcross . The route at SR 140 (Jimmy Carter Boulevard) and goes north along

1482-419: Is used extensively in the reconstruction of existing freeways as well as constructing new freeways, particularly in dense urban environments. Sometimes a SPUI will allow traffic to proceed straight through from the offramp to the onramp; this usually happens when the ramps connect with frontage roads . Since most through traffic travels over or under the intersection, the SPUI is still much more efficient than

1539-406: Is vested in the federal states of Germany. Most federal states use the term Landesstraße (marked with 'L'), while for historical reasons Saxony and Bavaria use the term Staatsstraße (marked with 'S'). The appearance of the shields differs from state to state. The term Land-es-straße should not be confused with Landstraße , which describes every road outside built-up areas and

1596-671: The Buckhead neighborhood of Atlanta , in Fulton County . It travels to the northeast to an intersection with SR 237 (Piedmont Road NE). Just after that intersection, it goes over, but does not have an interchange with SR 400 (T. Harvey Mathis Parkway). Immediately after is the southern terminus of SR 141 Connector (Lenox Road NE). The highway passes just northwest of the Buckhead Heights neighborhood, crosses into DeKalb County , and passes through Brookhaven . SR 141 passes Oglethorpe University and

1653-626: The Strada statale 7 Via Appia , which broadly follows the route of the Roman road of the same name . Other examples are the Strada statale 1 Via Aurelia ( Via Aurelia ) and the Strada statale 4 Via Salaria ( Via Salaria ). Since the reforms following the birth of the Kingdom of Italy in 1861, the State took charge of the construction and maintenance of a primary network of roads for connections between

1710-510: The Town Center at Aurora shopping center in Aurora, Colorado , United States (at 39°42′40″N 104°49′33″W  /  39.711189°N 104.825807°W  / 39.711189; -104.825807 ). A three-level SPUI is similar to a standard SPUI but includes an additional grade separation allowing for free-flowing through traffic on the crossroad; such through traffic thus bypasses

1767-472: The "side road" at this interchange. The southbound carriageway of SR 7 bridges over the interchange, while its northbound carriageway remains at-grade. SR 7's left on- and offramps run between its carriageways, meeting the I-470 ramps at an at-grade intersection. The I-470 ramps proceed to a trumpet interchange with I-470. I-470 itself bridges over both carriageways of SR 7 a short distance north of

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1824-618: The I-470/SR ;7 ramps' intersection. This design was likely chosen not for cost savings but because the northbound carriageway of SR 7 is bordered by railroad tracks, commercial properties, and the Ohio River and because I-470 bridges the river just east of SR 7—a more conventional interchange design was likely more difficult to achieve. There is another such interchange in Millvale, Pennsylvania , near Pittsburgh , at

1881-471: The Peachtree Golf Club, just before passing through Chamblee . In Doraville , it has an intersection with SR 13 Connector and an interchange with Interstate 285 (I-285). The road becomes a freeway on the northeast of the interchange, served by a pair of one-way frontage roads with " Texas U-turns "; it has a few exits along its length. It enters Gwinnett County near the middle of

1938-433: The SPUI is the inverted SPUI , in which the carriageways of the free-flowing road are separated, with left on- and offramps running between the carriageways and coming to a single at-grade intersection with the cross street. This can be built less expensively than a standard SPUI by allowing for shorter, simpler bridges at the interchange. However, this inverts the usual convention of placing carriageway on- and offramps on

1995-577: The SR ;141 mainline (Peachtree Road NE) just northwest of the Buckhead Heights neighborhood of Atlanta. The highway heads northwest, curves to the west-southwest underneath, where it crosses SR 400 (T. Harvey Mathis Parkway) with a single-point urban interchange . It curves to the southwest to meet its northern terminus, an intersection with SR 237 (Piedmont Road NE), at the Buckhead Forest neighborhood of Atlanta. SR 141 Conn.

2052-422: The bridge approach, while the southbound carriageway had a continuous green T-intersection with the bridge. An offset SPUI is similar to a diamond interchange, however, by making two of the ramps flyovers or flyunders , all ramps are pushed to one side of the highway, where they meet the surface street at a single intersection. An example of this is the interchange between Interstate 225 and Alameda Avenue near

2109-783: The changes made by Chamblee. This change was implemented in 2023. In 2013, Gwinnett County decreased the speed limit the road to 45 mph between SR 141 (Peachtree Parkway) and SR 20 (Nelson Brogdon Boulevard) and 50 mph between SR 20 and the Hall County line. The goal of the change was to reduce speeding and accidents. In June 2018, the Atlanta Regional Commission Board approved funding to equip intersections along Peachtree Industrial Boulevard with connected vehicle technology. Gwinnett County has looked at adding and improving sidewalks along Peachtree Industrial Boulevard. The Western Gwinnett Bikeway

2166-409: The cities of Peachtree Corners , Duluth , Suwanee , Sugar Hill , and Buford. The portion of the road concurrent with SR 141 is maintained by the state; the rest is maintained by Gwinnett County. Peachtree Industrial Boulevard was originally built in the 1960s. The portion of the road concurrent to SR 141 was upgraded to a limited-access highway in the 1980s and 1990s. In 2008, the section within

2223-644: The cities of the Central Valley , Route 128 in Massachusetts, or parts of Route 101 in New Hampshire). Each state has its own system for numbering and its own marker. The default marker is a white circle containing a black sans serif number (often inscribed in a black square or slightly rounded square), according to the Manual on Uniform Traffic Control Devices (MUTCD). However each state

2280-512: The city limits of Chamblee was renamed to Peachtree Boulevard, to reflect the changing nature of the city. Prior to this change, the "industrial" name extended until Peachtree Road merges in near the city line with present-day Brookhaven . In November 2018, the Doraville City Council passed a resolution to authorize the city manager to rename Peachtree Industrial Boulevard within the city limits to Peachtree Boulevard, following

2337-475: The compressed on- and offramps. However, this disadvantage poses less of a problem in cases where the arterial, or nonfreeway road, already requires a very wide bridge. The intersection of 97 Street , having seven throughlanes, with Yellowhead Trail in Edmonton , Alberta, Canada, though a diamond interchange in concept, required such a wide bridge that traffic-signal phasing allows this intersection to behave as

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2394-495: The end of the 1980s, and in some states, some less important National Routes were downgraded to State Routes. Each state has or had its own numbering scheme, but do not duplicate National Route numbers in the same state, or nearby routes in another state. As with the National Routes and National Highways, State Routes are being phased out in most states and territories in favour of alphanumeric routes. However, despite

2451-508: The fact that Victoria has fully adopted alphanumeric routes in regional areas, state route numbers are still used extensively within the city of Melbourne as a part of its Metropolitan Route Numbering Scheme . Brazil is another country that is divided into states and has state highways. For example, the longest highway in the state of São Paulo , the Rodovia Raposo Tavares , is designated as SP-270 and SP-295 . Canada

2508-593: The free-flowing road is at-grade with but still separated from the side road, as found in a continuous green T- (or seagull) intersection . There is one such interchange in Pultney Township, Belmont County, Ohio , between State Route 7 (SR 7) and Interstate 470 (I-470) at 40°02′52″N 80°44′01″W  /  40.047657°N 80.733542°W  / 40.047657; -80.733542 . The ramps leading to and from I-470 run west of, but are not directly connected to, SR 7; these ramps form

2565-594: The freeway; near the end of the freeway is SR 140 where it is called Peachtree Parkway. It passes through Peachtree Corners . Then, it crosses over the Chattahoochee River back into Fulton County. It travels through Johns Creek and meets SR 120 (Abbotts Bridge Road). Northeast of there, it enters Forsyth County . The roadway curves to the northwest and then to the north. It has an interchange with US 19/SR 400 (Hospitality Highway), southwest of Cumming . Until 2020, SR 141 ended just to

2622-462: The interchange type. Drivers making a left turn may become confused as oncoming turning traffic passes them on the righthand side. Due to the large intersection area, the traffic lights need a longer yellow and red phase to clear the intersection, and, even then, it may not be long enough for a bicyclist entering on green or yellow to make it across before opposing traffic gets a green. In general, SPUI designs should not be used where bicycle traffic

2679-494: The junction between Pennsylvania Route 28 (PA 28) and the 40th Street Bridge . The northbound carriageway of PA 28 passes under the interchange, with lefthand ramps meeting at the bridge (the northbound entrance ramp does not provide direct access to PA 28). The southbound carriageway of PA 28 has a continuous green T-intersection with the bridge. A similar interchange exists in Coal Grove, Ohio , at

2736-587: The junction of U.S. Route 52 (US 52) with the Ben Williamson Memorial Bridge and the Simeon Willis Memorial Bridge , which cross the Ohio River and lead to and from Ashland, Kentucky , respectively. The eastbound carriageway of US 52 passes under the interchange, with lefthand exit and entrance ramps to the bridges. The westbound carriageway of US 52, which narrows to one throughlane, has

2793-541: The main cities; in 1865 the Lanza law introduced the classification of roads between national, provincial and municipal (see Annex F, art.10) and the Royal Decree of 17 November 1865, n. 2633 listed the first 38 national roads. Italian state highways are identified by a number and a name. In road signs and maps the number is preceded by the acronym SS, an acronym for strada statale ("state road"). The nomenclature of

2850-482: The next important roads under the National highways . The number has two, three, or four digits. Highways with two-digit numbers routes are called State-funded local highways. State roads ( Turkish : Devlet yolu ) are primary roads, mostly under the responsibility of General Directorate of Highways (KGM) except in metropolitan city centers where the responsibility falls into the local government. The roads have

2907-555: The northwest at SR 9, but it was extended north on Bethelview Road where it now ends at SR 20 . SR 371 was removed from the state highway system as a mileage swap in order to add Bethelview Road to the state highway system. All of SR 141 from its southern terminus in Buckhead to a point southwest of Duluth is part of the National Highway System , a system of roadways important to the nation's economy, defense, and mobility. State Route 141 Connector ( SR 141 Conn. )

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2964-632: The other. In some countries such as New Zealand , the word "state" is used in its sense of a sovereign state or country. By this meaning a state highway is a road maintained and numbered by the national government rather than local authorities. Australia 's important urban and inter-regional routes not covered by the National Highway or National Route systems are marked under the State Route system. They can be recognised by blue shield markers. They were practically adopted in all states by

3021-408: The right side of the carriageway, instead placing them on the left side, usually considered the passing lane . There is also a variant of the inverted SPUI, which can be used when a side road ends at, rather than crossing, a free-flowing road. In this variant, one carriageway of the free-flowing road is grade-separated from the side road, as with a typical inverted SPUI, while the other carriageway of

3078-640: The state highways managed by ANAS generally follows the SS n scheme, where n is a number ranging from 1 ( Aurelia ) up to 700 (of the Royal Palace of Caserta ) depending on the date of establishment of the state highway. Newly built ANAS roads, not yet classified, are identified by the acronym NSA, an acronym for nuova strada ANAS ("new ANAS road"). State highways can be technically defined as main extra-urban roads (type B road) or as secondary extra-urban roads (type C road). State highways that cross towns with

3135-468: The system is completely unsigned, aside from the Trans-Canada routes. This makes Canada unique in that national highway designations are generally secondary to subnational routes. In Germany , state roads ( Landesstraßen or Staatsstraßen ) are a road class which is ranking below the federal road network ( Bundesstraßen ). The responsibility for road planning, construction and maintenance

3192-530: The word "state" in this sense means "government" or "public" (as in state housing and state schools ), not a division of a country. New Zealand's state highway system is a nationwide network of roads covering the North Island and the South Island . As of 2006, just under 100 roads have a "State Highway" designation. The NZ Transport Agency administers them. The speed limit for most state highways

3249-532: Was designed by Wallace Hawkes, Director of Transportation Engineering at J. E. Greiner Company (later URS Corporation ), who has been called the "granddaddy of the urban interchange". This design has since been altered to include frontage roads in each direction. Several SPUIs, built in the 1970s and later, are located on German autobahns, like the A40 , A42 , A44 , A46 , A57 , A59 , and A113 in Berlin . There

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