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58-528: The Centennial Bowl is a freeway interchange in Las Vegas , in the U.S. state of Nevada , in the Centennial Hills neighborhood. It serves Interstate 11 (I-11)/ U.S. Route 95 (US 95) and Clark County Route 215 (CC 215; Bruce Woodbury Beltway). After the full completion of the interchange in 2023, the beltway was upgraded to freeway standards in its entirety. Originally,

116-461: A right-in/right-out (RIRO) onto US 95 north. The situation was even less direct for southbound US 95 traffic getting onto the beltway; southbound traffic would have to either exit the interchange at Durango Drive then follow Oso Blanca Road south to its intersection at CC 215, or exit via a RIRO, turn right onto Centennial Center Boulevard, and enter CC 215 via the beltway/Durango Drive interchange. In August 2015, construction of

174-407: A teardrop shape, with the points facing towards the center of the interchange. Longer ramps are often required due to line-of-sight requirements at roundabouts. A partial cloverleaf interchange (often shortened to the portmanteau, parclo ) is an interchange with loops ramps in one to three quadrants, and diamond interchange ramps in any number of quadrants. The various configurations are generally

232-457: A 4-leaf clover. Other species that have been sold as "4-leaf clovers" include Marsilea quadrifolia . A description from 1869 says that 4-leaf clovers were "gathered at night-time during the full moon by sorceresses, who mixed it with vervain and other ingredients, while young girls in search of a token of perfect happiness made quest of the plant by day." In an 1877 letter to St.   Nicholas Magazine , an 11-year-old girl wrote, "Did

290-420: A CC 215 interchange with Sky Pointe Drive and connecting ramps to Oso Blanca Road, a CC 215 east–US 95 north flyover, a CC 215 west–US 95 north ramp, a US 95 south–CC 215 east ramp, and conversion of CC 215 from interim roadway to freeway within the interchange area. On December 4, 2023, the $ 272 million Centennial Bowl project finished construction. In May 2024, US 95

348-399: A complex appearance and are often colloquially described as Mixing Bowls , Mixmasters (for a Sunbeam Products brand of electric kitchen mixers ), or as Spaghetti Bowls or Spaghetti Junctions (being compared to boiled spaghetti ). However, they consume a significantly smaller area of land compared to a cloverleaf interchange. A combination interchange (sometimes referred to by

406-549: A day (to be sealed in plastic as "lucky charms") by introducing a genetically engineered ingredient to the plants to encourage the aberration (there are, however, widely available cultivars that regularly produce leaves with multiple leaflets – see below). There are some cultivars of white clover ( Trifolium repens ) which regularly produce more than three leaflets, including purple-leaved T. repens "Purpurascens Quadrifolium" and green-leaved T. repens "Quadrifolium". Some clovers have more spade-shaped leaves, rather than

464-435: A design seen in an Argentinian magazine. A system interchange connects multiple controlled-access highways, involving no at-grade signalised intersections. A cloverleaf interchange is a four-legged junction where left turns across opposing traffic are handled by non-directional loop ramps. It is named for its appearance from above, which resembles a four-leaf clover . A cloverleaf is the minimum interchange required for

522-475: A directional T interchange) is typically used when a three-way interchange is required for two or three highways interchanging in semi-parallel/perpendicular directions, but it can also be used in right-angle case as well. Their connecting ramps can spur from either the right or left side of the highway, depending on the direction of travel and the angle. Directional T interchanges use flyover/underpass ramps for both connecting and mainline segments, and they require

580-412: A dumbbell interchange or a dogbone interchange, is similar to the diamond interchange, but uses a pair of roundabouts in place of intersections to join the highway ramps with the crossroad. This typically increases the efficiency of the interchange when compared to a diamond, but is only ideal in light traffic conditions. In the dogbone variation, the roundabouts do not form a complete circle, instead having

638-659: A four-legged system interchange. Although they were commonplace until the 1970s, most highway departments and ministries have sought to rebuild them into more efficient and safer designs. The cloverleaf interchange was invented by Maryland engineer Arthur Hale, who filed a patent for its design on May   24, 1915. The first one in North America opened on December   15, 1929, in Woodbridge, New Jersey, connecting New Jersey Route   25 and Route   4 (now U.S. Route   1/9 and New Jersey Route   35). It

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696-761: A higher number of leaflets in each generation. Shigeo Obara used the method of natural crossbreeding, while Yoshiharu Watanabe used both natural crossbreeding and manual crossbreeding. The world record for number of four-leaf clovers collected in one hour by an individual is 451, set by American Gabriella Gerhardt in 2019. Gerhardt also has a record-breaking collection of 118,791 four-leaf clovers, as well as 1437 six-leaf clovers and 209 seven-leaf. As stated, clovers can have more than four leaves. 5-leaf clovers are less commonly found naturally than 4-leaf clovers; however, they too have been successfully cultivated. Some 4-leaf clover collectors, particularly in Ireland, regard

754-667: A moderate amount of land and moderate costs since only two levels of roadway are typically used. Their name derives from their resemblance to the capital letter T, depending upon the angle from which the interchange is seen and the alignment of the roads that are interchanging. It is sometimes known as the "New England Y", as this design is often seen in the northeastern United States, particularly in Connecticut. This type of interchange features directional ramps (no loops, or weaving right to turn left) and can use multilane ramps in comparatively little space. Some designs have two ramps and

812-454: A parclo AB features a loop ramp approaching the crossroad in one direction, and beyond the crossroad in the opposing direction, as in the example image. A diverging diamond interchange (DDI) or double crossover diamond interchange (DCD) is similar to a traditional diamond interchange, except the opposing lanes on the crossroad cross each other twice, once on each side of the highway. This allows all highway entrances and exits to avoid crossing

870-463: A patent for the design of a cloverleaf interchange on May   24, 1915, though the conceptual roadwork was not realised until a cloverleaf opened on December   15, 1929, in Woodbridge, New Jersey , connecting New Jersey Route 25 and Route 4 (now U.S. Route 1/9 and New Jersey Route 35 ). It was designed by Philadelphia engineering firm Rudolph and Delano, based on

928-418: A role in the frequency of development of four-leaf clovers in cloverplants. A plant hormone called auxin , which plays an important role in plant development , has also been shown to increase the probability of mutations in clovers, especially the development of clovers with more than 4 leaves (reportedly, 5, 6, 7, and 8-leaf clovers were able to be produced by putting a dose of phosphate fertilizer (double than

986-439: A safer modification of the cloverleaf design, due to a partial or complete reduction in weaving, but may require traffic lights on the lesser-travelled crossroad. Depending on the number of ramps used, they take up a moderate to large amount of land, and have varying capacity and efficiency. Parclo configurations are given names based on the location of and number of quadrants with ramps. The letter A denotes that, for traffic on

1044-543: A small angle and meet the non-freeway at almost right angles. These ramps at the non-freeway can be controlled through stop signs , traffic signals , or turn ramps. Diamond interchanges are much more economical in use of materials and land than other interchange designs, as the junction does not normally require more than one bridge to be constructed. However, their capacity is lower than other interchanges and when traffic volumes are high they can easily become congested. A double roundabout diamond interchange, also known as

1102-401: A three-level semi-directional T at Highway 407 and a two-level semi-directional T at Highway 401 . Service interchanges are used between a controlled-access route and a crossroad that is not controlled-access. A full cloverleaf may be used as a system or a service interchange. A diamond interchange is an interchange involving four ramps where they enter and leave the freeway at

1160-509: A three-way interchange. However, in a semi-directional T, some of the splits and merges are switched to avoid ramps to and from the passing lane , eliminating the major disadvantage of the directional T. Semi-directional T interchanges are generally safe and efficient, though they do require more land and are costlier than trumpet interchanges. Semi-directional T interchanges are built as two- or three-level junctions, with three-level interchanges typically used in urban or suburban areas where land

1218-442: A toll road meets another toll road or a free highway. They are also useful when most traffic on the terminating highway is going in the same direction. The turn that is used less often would contain the slower loop ramp. Trumpet interchanges are often used instead of directional or semi-directional T or Y interchanges because they require less bridge construction but still eliminate weaving. A full Y-interchange (also known as

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1276-422: A traditional stack interchange. A three-level roundabout interchange features a grade-separated roundabout which handles traffic exchanging between highways. The ramps of the interchanging highways meet at a roundabout , or rotary, on a separated level above, below, or in the middle of the two highways. These interchanges can also be used to make a "linking road" to the destination for a service interchange, or

1334-446: Is a 3-level stack, since the semi-directional ramps are spaced out far enough, so they do not need to cross each other at a single point as in a conventional 4-level stack. Stacks are significantly more expensive than other four-way interchanges are due to the design of the four levels; additionally, they may suffer from objections of local residents because of their height and high visual impact. Large stacks with multiple levels may have

1392-428: Is an alternative four-way directional interchange. The turbine interchange requires fewer levels (usually two or three) while retaining directional ramps throughout. It features right-exit, left-turning ramps that sweep around the center of the interchange in a clockwise spiral . A full turbine interchange features a minimum of 18 overpasses, and requires more land to construct than a four-level stack interchange; however,

1450-477: Is braided when at least one of the roadways reverses sides. It seeks to make left and right turns equally easy. In a pure braided interchange, each roadway has one right exit, one left exit, one right on-ramp, and one left on-ramp, and both roadways are flipped. The first pure braided interchange was built in Baltimore at Interstate 95 at Interstate 695 ; however, the interchange was reconfigured in 2008 to

1508-470: Is more expensive. In a three-level semi-directional T, the two semi-directional ramps from the terminating highway cross the surviving highway at or near a single point, which requires both an overpass and underpass. In a two-level semi-directional T, the two semi-directional ramps from the terminating highway cross each other at a different point than the surviving highway, necessitating longer ramps and often one ramp having two overpasses. Highway 412 has

1566-419: Is not clear when or how this idea began. One early mention of "Fower-leafed or purple grasse" is from 1640 and simply says that it was kept in gardens because it was "good for the purples in children or others". A 2017 survey of approximately 5.7 million clovers in six European countries found the frequency of 4-leaf clovers to be about 5000 to 1 (one 4-leaf clover for every ~5000 normal 3-leaf clovers), twice

1624-400: The controlled-access highway , the loop ramps are located in advance of (or approaching ) the crossroad, and thus provide an onramp to the highway. The letter B indicated that the loop ramps are beyond the crossroad, and thus provide an offramp from the highway. These letters can be used together when opposite directions of travel on the controlled-access highway are not symmetrical, thus

1682-403: The "inside" through road (on the same side as the freeway that ends) crossing each other at a three-level bridge. The directional T interchange is preferred to a trumpet interchange because a trumpet requires a loop ramp by which speeds can be reduced, but flyover ramps can handle much faster speeds. The disadvantage of the directional T is that traffic from the terminating road enters and leaves on

1740-521: The 1920s and 1930s in Italy, Germany, the United States, and Canada. Initially, these roads featured at-grade intersections along their length. Interchanges were developed to provide access between these new highways and heavily-travelled surface streets. The Bronx River Parkway and Long Island Motor Parkway were the first roads to feature grade-separations. Maryland engineer Arthur Hale filed

1798-408: The 5-leaf clover, known as a rose clover, as a particular prize. It is debated whether the fourth leaf is caused genetically or environmentally. Its relative rarity (1 in ~5,000 clovers ) suggests a possible recessive gene appearing at a low frequency. Alternatively, four-leaf clovers could be caused by somatic mutation or a developmental error of environmental causes. They could also be caused by

Centennial Bowl - Misplaced Pages Continue

1856-464: The Centennial Bowl interchange project began. In July 2017, the first flyover of the interchange was completed, connecting CC 215 west to US 95 south. Around this time, a US 95 north–CC 215 east ramp was built. In September 2020, the second and longest flyover was completed, connecting US 95 north to CC 215 west and replacing a loop ramp connecting US 95 to

1914-485: The United States opened on July   7, 2009, in Springfield, Missouri , at the junction of Interstate 44 and Missouri Route 13 . A single-point urban interchange (SPUI) or single-point diamond interchange (SPDI) is a modification of a diamond interchange in which all four ramps to and from a controlled-access highway converge at a single, three-phase traffic light in the middle of an overpass or underpass. While

1972-465: The University of Georgia have reported finding the gene that turns ordinary three-leaf clovers into the coveted four-leaf types. Masked by the three-leaf gene and strongly influenced by environmental conditions, molecular markers now make it possible to detect the presence of the gene for four-leaves and for breeders to work with it. The results of the study, which also located two other leaf traits in

2030-636: The beltway. It is the second longest bridge in Nevada after the I-11 viaduct (then-signed as I-515 ) in Downtown Las Vegas . In October 2020, the third flyover ramp was completed, connecting US 95 south to CC 215 east, but with a few delays, but finally opened in the start of 2023, along with a CC 215 east–US 95 south ramp. In January 2021, the $ 155 million final phase of Centennial Bowl construction began. This project included

2088-401: The bridges are generally short in length. Coupled with reduced maintenance costs, a turbine interchange is a less costly alternative to a stack. A windmill interchange is similar to a turbine interchange, but it has much sharper turns, reducing its size and capacity. The interchange is named for its similar overhead appearance to the blades of a windmill . A variation of the windmill, called

2146-485: The commonly stated probability of 10,000 to 1. According to this survey, the frequency of a 5-leaf clover is ~24,400 to 1, and of a 6-leaf clover is ~312,500 to 1. The exact reported frequencies are 5076 to 1 for 4-leaf clovers; 24,390 to 1 for 5-leaf clovers; and 312,500 to 1 for 6-leaf clovers. The clover with the most leaves ever found had 63 of them, and was discovered by Yoshiharu Watanabe of Nasushiobara city, Tochigi prefecture , Japan , on 2 August 2023. The clover

2204-507: The compact design is safer, more efficient, and offers increased capacity—with three light phases as opposed to four in a traditional diamond, and two left turn queues on the arterial road instead of four—the significantly wider overpass or underpass structure makes them more costly than most service interchanges. Since single-point urban interchanges can exist in rural areas, such as the interchange of U.S. Route 23 with M-59 in Michigan ;

2262-537: The creation of a new basic road as a service interchange. Trumpet interchanges may be used where one highway terminates at another highway, and are named as such for to their resemblance to trumpets . They are sometimes called jug handles . These interchanges are very common on toll roads , as they concentrate all entering and exiting traffic into a single stretch of roadway, where toll plazas can be installed once to handle all traffic, especially on ticket-based tollways . A double-trumpet interchange can be found where

2320-448: The diverging windmill, increases capacity by altering the direction of traffic flow of the interchanging highways, making the connecting ramps much more direct. There also is a hybrid interchange somewhat like the diverging windmill in which left turn exits merge on the left, but it differs in that the left turn exits use left directional ramps. A braided or diverging interchange is a two-level, four-way interchange. An interchange

2378-442: The interaction of several genes that happen to segregate in the individual plant. It is possible all four explanations could apply to individual cases. This means that multiple four-leaf clovers could be found in the same cloverplant, and a cloverplant that already has a clover with an abnormal number of leaflets has a higher chance of growing or having another abnormal clover than a cloverplant that doesn't have any. Researchers from

Centennial Bowl - Misplaced Pages Continue

2436-481: The interchange at US 95 and CC 215 at Centennial Hills built in 2003 did not have any flyover ramps and no direct access for some directions. The original interchange had US 95 at freeway standards, but CC 215 with two temporary at-grade intersections . Traffic on the beltway that needed to travel northbound on US 95 would have to turn onto Sky Pointe Drive at a traffic light, turn left to continue on Sky Pointe Drive, and then finally turn left onto

2494-449: The normal dose) in the soil where "special" white clover seeds were put (from a special cultivar that produces 4-leaf clovers more frequently than what normal cloverplants do), as well as watering these seeds with a 0.7% solution of auxin in water, during the course of the 10-day experiment). There are reports of farms in the US which specialize in four-leaf clovers, producing as many as 10,000

2552-594: The opposite direction of travel and saves one signal phase of traffic lights each. The first DDIs were constructed in the French communities of Versailles ( A13 at D182), Le Perreux-sur-Marne ( A4 at N486) and Seclin ( A1 at D549), in the 1970s. Despite the fact that such interchanges already existed, the idea for the DDI was "reinvented" around 2000, inspired by the freeway-to-freeway interchange between Interstate 95 and I-695 north of Baltimore . The first DDI in

2610-513: The passing lane, so the semi-directional T interchange (see below) is preferred. The interchange of Highway 416 and Highway 417 in Ontario, constructed in the early 1990s, is one of the few directional T interchanges, as most transportation departments had switched to the semi-directional T design. As with a directional T interchange, a semi-directional T interchange uses flyover (overpass) or underpass ramps in all directions at

2668-543: The portmanteau, cloverstack ) is a hybrid of other interchange designs. It uses loop ramps to serve slower or less-occupied traffic flow , and flyover ramps to serve faster and heavier traffic flows. If local and express ways serving the same directions and each roadway is connected righthand to the interchange, extra ramps are installed. The combination interchange design is commonly used to upgrade cloverleaf interchanges to increase their capacity and eliminate weaving. Some turbine-stack hybrids: The turbine interchange

2726-467: The problem of weaving, and due to the semi-directional flyover ramps and directional ramps, they are generally safe and efficient at handling high traffic volumes in all directions. A standard stack interchange includes roads on four levels, also known as a 4-level stack, including the two perpendicular highways, and one more additional level for each pair of left-turn ramps. These ramps can be stacked (cross) in various configurations above, below, or between

2784-455: The rightmost lane. After demerging from right-turning traffic, they complete their left turn by crossing both highways on a flyover ramp or underpass. The penultimate step is a merge with the right-turn on-ramp traffic from the opposite quadrant of the interchange. Finally, an on-ramp merges both streams of incoming traffic into the left-bound highway. As there is only one off-ramp and one on-ramp (in that respective order), stacks do not suffer from

2842-421: The road is extended. US 70 and US 17 west of New Bern, North Carolina is an example. A stack interchange is a four-way interchange whereby a semi-directional left turn and a directional right turn are both available. Usually, access to both turns is provided simultaneously by a single off-ramp. Assuming right-handed driving, to cross over incoming traffic and go left, vehicles first exit onto an off-ramp from

2900-727: The term single-point diamond interchange is considered the correct phrasing. Single-point interchanges were first built in the early 1970s along U.S. Route 19 in the Tampa Bay area of Florida , including the SR 694 interchange in St. Petersburg and SR 60 in Clearwater . Four-leaf clover The four-leaf clover is a rare variation of the common three-leaf clover that has four leaflets instead of three. According to traditional sayings, such clovers bring good luck , although it

2958-451: The three in the study were very rare. These traits can be quite attractive, particularly if combined with others, and can turn clover into an ornamental plant for use in flower beds. According to an experiment made in 2019 by the, at that moment, 17-year old Minori Mori, from Tsukuba , Japan, four-leaf clovers seem to be more likely to appear in well- fertilized soil. Phosphates (a common ingredient in fertilizers) have been proved to play

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3016-502: The two interchanging highways. This makes them distinct from turbine interchanges, where pairs of left-turn ramps are separated but at the same level. There are some stacks that could be considered 5-level; however, these remain four-way interchanges, since the fifth level actually consists of dedicated ramps for HOV /bus lanes or frontage roads running through the interchange. The stack interchange between I-10 and I-405 in Los Angeles

3074-446: The usual rounded ones. This may be a genetic mutation. Some genetic mutations in clovers include spade-like shaped leaves or a dotted rusty color on the leaves. Trifolium repens "Good Luck" is a cultivar which has three, four, or five green, dark-centered leaflets per leaf. Other plants may be mistaken for, or misleadingly sold as, "4-leaf clovers"; for example, Oxalis tetraphylla is a species of wood sorrel with leaves resembling

3132-637: The white-clover genome, were reported in the July/August 2010 edition of Crop Science , published by the Crop Science Society of America. The other leaf traits, the red fleck mark and red midrib, a herringbone pattern that streaks down the center of each leaflet in a bold red color, were mapped to nearby locations, resolving a century-old question as to whether these leaf traits were controlled by one gene or two separate genes. White clover has many genes that affect leaf color and shape, and

3190-540: Was considered a revolutionary design at the time of its construction. A cloverleaf offers uninterrupted connections between two roads but suffers from weaving issues. Along the mainline, a loop ramp introduces traffic prior to a second loop ramp providing access to the crossroad, between which ingress and egress traffic mixes. For this reason, the cloverleaf interchange has fallen out of favour in place of combination interchanges . Some may be half cloverleaf containing ghost ramps which can be upgraded to full cloverleafs if

3248-596: Was designed by Philadelphia engineering firm Rudolph and Delano based on a design seen in an Argentinian magazine. The first cloverleaf in Canada opened in 1938 at the junction of Highway 10 and what would become the Queen Elizabeth Way . The first cloverleaf outside of North America opened in Stockholm on October   15, 1935. Nicknamed Slussen , it was referred to as a "traffic carousel" and

3306-446: Was from the species Trifolium repens L., or the white clover ; beating the previous record, a 56-leaf clover (of the same species) found by Shigeo Obara of Hanamaki city, Iwate prefecture , Japan, on 10 May 2009. Both men obtained clovers with such a number of leafleats through crossbreeding cloverplants with a high rate of clovers with an abnormal number of leaflets, causing that, on average, cloverplants generated clovers with

3364-418: Was redesignated as I-11 due to an expansion in Nevada, linking Las Vegas and Phoenix. Interchange (road) Note: The descriptions of interchanges apply to countries where vehicles drive on the right side of the road. For left-side driving, the layout of junctions is mirrored. Both North American (NA) and British (UK) terminology is included. The concept of the controlled-access highway developed in

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