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Topic: Diamond interchange

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	Diamond interchange biography .ms (Site not responding. Last check: 2007-10-12)
		Diamond interchanges are used where a freeway crosses a minor road.
		In the United States, where this form of interchange is very common, particularly in rural areas, traffic on the off-ramp typically faces a stop sign at the minor road, while traffic turning onto the freeway is unrestricted.
		The diamond interchange makes more efficient use of space than most types of freeway interchange, and avoids the interweaving traffic flows that occur in interchanges such as the cloverleaf.
	www.biography.ms /Diamond_interchange.html (205 words)

	Interchange of the Week-#58
		Diamond interchanges are as common in urban areas as rural.
		At left is an example of a non-freeway diamond interchange in the Town of Henrietta.
		A half diamond (left) is used where traffic patterns require a connection in one direction only, or as a supplement to a nearby interchange.
	www.empirestateroads.com /week/week58.html (564 words)

	Kurumi's Field Guide to Interchanges - Glossary
		An interchange between two freeways where access is provided by an auxiliary divided road, connected to each freeway with a trumpet interchange.
		In our context (interchange diagrams), a freeway is a road with full access control in the interchange area: the reason an interchange is used instead of an at-grade, signalized intersection.
		A newer type of diamond where the diagonal ramps are instead placed as close as possible paralleling the freeway, so that ramp traffic in effect meets at a single point on the surface street directly below (or above) the freeway.
	www.kurumi.com /roads/interchanges/gloss.html (1252 words)

	Superpave Comes of Age—A State's Perspective, November/December 2002 Public Roads
		Although a diamond interchange is the most common interchange type, it creates unnecessary delay at signals and stop signs and may cause spillback onto a freeway.
		The off-ramps for the diamond interchange were flared from one lane to two lanes at the entry to provide a 60-meter (197-foot) right-turn lane.
		In the weekday off-peak scenario, the capacity is approximately 4,300 vph for the double-roundabout interchange and 4,700 for the single-roundabout interchange.
	www.tfhrc.gov /pubrds/02nov/10.htm (3346 words)

	Mississippi @ SouthEastRoads.com - Interstate 55 Northbound
		The first of nine Pike County interchanges of the north-south freeway is situated one mile to the north.
		Northbound at the diamond interchange of Exit 1 with Mississippi 584.
		This diamond interchange is just over a mile west of the central business district of the city.
	www.southeastroads.com /i-055a_ms.html (1337 words)

	Office of Roadway Engineering Services
		An interchange is a grade-separated intersection (one road passes over another) with ramps to connect them.
		The diamond interchange is the most common type where a major facility intersects a minor highway.
		Cloverleaf or partial cloverleaf designs may be used in lieu of a diamond when development or other physical conditions prohibit construction in a quadrant, or where heavy left turns are involved.
	www.dot.state.oh.us /roadwayengineering/studies/interchange_info.asp (620 words)

	FHWA - MUTCD - 2003 Edition Figure 2e-12 Long Description
		Interchange 9, the eastern junction with Interstate 22
		Interchange 12, the northern junction with Interstate 73
		Interchange 28, the southern junction with Interstate 73.
	mutcd.fhwa.dot.gov /htm/2003/part2/fig2e-12_longdesc.htm (291 words)

	Interchanges: Diamond
		These types of parclos are also known as folded diamonds, as one or more ramps are "folded" into a loop on the opposite side of the surface street.
		Though these inner diamonds concentrate ramp traffic at a single point in the center, the Single-point Urban Interchange achieves that with right-hand exit ramps.
		A more benign diamond variant is the "roundabout interchange", where a roundabout is placed at the end of each exit ramp/entrance ramp intersection.
	www.kurumi.com /roads/interchanges/diamond.html (458 words)

	Louisiana @ SouthEastRoads.com - Interstate 220
		The first interchange of Interstate 220 westbound is situated close in proximity to the terminus at Interstate 20.
		Therefore the 0.50-mile overhead of the Exit 17A interchange with U.S. 79 & 80 (Texas Avenue) is posted on the eastbound off-ramp of Interstate 20 to Interstate 220 west.
		The interchange between the two highways and Interstate 20 is a directional cloverleaf with high-speed flyovers for the movements to Interstate 20 west and from Interstate 20 east.
	www.southeastroads.com /i-220_la.html (627 words)

	Diamond interchange - Wikipedia, the free encyclopedia
		A diamond interchange is a common type of road junction.
		But where there is significant traffic, the two intersections within the interchange may cause congestion and accidents, requiring additional features such as traffic lights and extra lanes dedicated to turning traffic, or (as in the United Kingdom) a pair of roundabouts to create a type of junction called a dumbbell interchange.
		Where HOV lanes are present for carpooling, the ramps of a diamond interchange may be "folded" to the inside lanes instead of the outside.
	en.wikipedia.org /wiki/Diamond_interchange (539 words)

	Three-level diamond - Wikipedia, the free encyclopedia
		In a three-level diamond interchange, the two main roads are on separate levels, and on a third level, usually in the middle, there is a square of one-way roads.
		In Cedar Rapids, a slight variation of the three-level diamond interchange is formed where the collector/distributor roads for Interstate 380 and Collins Rd (Iowa Highway 100) intersect.
		On the East Coast, a 3-level diamond interchange is utilized for Interstate 476 and U.S. Route 1 near Springfield in Delaware County.
	en.wikipedia.org /wiki/Volleyball_interchange (388 words)

	Proposed Indianapolis Interstate Interchange Improvement Projects
		This interchange is interconnected with the Shadeland Ave.
		This interchange is basically being downgraded to a partial cloverleaf, with one dual-lane flyover ramp from I-465N to I-74W and a traffic signal on the west side of I-465.
		The interchange was reconstructed with the ramps for the current diamond interchange flared out to make room for the loop ramps, but nothing else has been done.
	www.urbanophile.com /arenn/trans/ichange.html (2983 words)

	J.F. Sato and Associates
		The Eagle Vail ½ Diamond is located where US 6 crosses under I-70 at milepost 169 approximately 2 miles West of the Dowd interchange.
		The significance of this project is related to the fact that the Dowd interchange is one of the worst accident locations on the I-70 corridor.
		JFSA faced the challenge of designing a half diamond interchange in challenging terrain without purchasing any additional right-of-way in a location where there was very little right-of-way to begin with.
	www.jfsato.com /trans_eagleVail.asp (326 words)

	Chapter 2 - ACTT Workshop: Utah - ACTT - Construction - Engineering - FHWA
		Retain the existing half-diamond interchange; correct ramp influence areas; install a traffic signal at Midland Drive/2550 South; and construct a connector road between 24th and 21st Streets on the east side of I-15.
		Retain the existing diamond interchange; correct ramp influence areas; improve sight distance at ramp termini by lengthening the mainline bridge; and install a traffic signal at the northbound on-/off-ramps.
		This interchange also has a power transmission line along the west side of the interchange and a sewer line suspended from the existing structures over the freeway.
	www.fhwa.dot.gov /construction/accelerated/wsut0503.cfm (867 words)

	WSDOT - I-405 - SR 515 Interchange Improvements
		WSDOT is building a new half-diamond interchange on I-405 east of the I-405 / SR 167 interchange at Talbot Road (SR 515) to improve access to downtown Renton and relieve traffic demand on the I-405 interchanges at SR 167 and SR 169.
		The new interchange reduces congestion at I-405 interchanges at SR 167 and SR 169 and for the SR 167 interchange at S 180th.
		The new interchange reduces traffic demand on the I-405 interchanges at SR 167 and SR 169, providing new access into downtown Renton, reducing congestion-related accidents in the Renton area.
	www.wsdot.wa.gov /Projects/i405/SR515Interchange (873 words)

	TecNote 1201 - Texas Diamond Modes in Free Operation
		The Texas diamond specification requires that when Ø3 is omitted, then Ø13 is also omitted from the sequence and if Ø7 is omitted, then Ø9 is omitted.
		Phase operation on the "left" side of the diamond interchange is completely independent of the phase operation on the "right" side of the diamond.
		The active max value (max1 or max2) is set to limit the frontage road extension phases so that the sum of the max value and the clearance times of the extension phases (Ø2 and Ø16) is less than the travel time between the frontage roads.
	www.naztec.com /tecnotes/tn1201.htm (4272 words)

	Route 22/322 Lewistown Narrows Project
		The interchange is located in Juniata County, northwest of Mifflintown.
		The "half-diamond" interchange was rebuilt to be a "full-diamond" for access in all directions.
		To accommodate a four-lane highway to the constraints of the river to the south and hillside to the north, the westbound lanes will be elevated at the western end of the project.
	www.penndot2.com /route22_322/index.html (456 words)

	Research Brief - Guidelines for Preliminary Selection of the Optimum Interchange Type for a Specific Location
		Extensive computer simulations of the interchange types were performed in order to determine traffic characteristics that affected operations at the interchanges.
		The diamond interchange operates at an acceptable LOS when the entering volume is at 1500 vph or less.
		Partial cloverleafs have a superior signalized LOS to the SPUI and diamond at all entering volumes that were studied, since large left-turning movements are handled by loop ramps.
	www.virginiadot.org /vtrc/briefs/99-r15rb/interchange_flash.htm (1093 words)

	Marquette Interchange construction photos
		On I-43 SB, signage for the upcoming WI-145 exit (Hillside Interchange), which is now a diamond interchange.
		interchange, also known as the Hillside Interchange, was rebuilt into a standard diamond interchange.
		More information about the Marquette Interchange project can be found online at http://www.mchange.org/ and at Marquette University's site located at http://www.marquette.edu/contact/interchange/.
	www.geocities.com /davenh/mchange (580 words)

	Oregon @ WestCoastRoads.com - Interstate 5 Northbound: Grants Pass to Roseburg
		The freeway elevates to 2,015 feet at Canyon Creek Pass ahead of the Mexia and Richie Roads diamond interchange of Exit 95.
		Oregon 99 emerges from its silent merge with Interstate 5 at the Exit 98 split-diamond interchange in Canyonville.
		The Exit 123 diamond interchange with Portland Avenue serves the Douglas County Fairgrounds and Umpqua Park between Interstate 5 and the Umpqua river.
	www.westcoastroads.com /oregon/i-005b_or.html (2126 words)

	Diverging diamond interchange - Wikipedia, the free encyclopedia
		A diverging diamond interchange is a rare form of diamond interchange in which the two directions of traffic on the non-freeway road cross to the opposite side on both sides of the bridge at the freeway.
		Like the continuous flow intersection, the diverging diamond interchange allows for two-phase operation at all signalized intersections within the interchange.
		The Ontario Ministry of Transportation is also planning a diverging diamond as part of interchange upgrades at Highway 427 and Rathburn Road in Toronto.
	en.wikipedia.org /wiki/Diverging_diamond_interchange (401 words)

	I-95 & S-83 Interchange (Site not responding. Last check: 2007-10-12)
		The interchange was constructed to serve the new Honda ATV plant in Florence County, near Timmonsville, South Carolina.
		CTE was responsible for the design of the interchange, the widening of Road S-83, and the design of the new bridge over I-95.
		A diamond interchange was designed and construction sequencing of the ramps was coordinated with Honda to provide required access for plant construction.
	www.cte.aecom.com /MarketsAndServices/39/45/index.jsp (155 words)

	Alternatives
		The current interchange alternatives still must go through more intensive evaluations, so some changes may be made in the next phase of the study.
		HOP-A – Hopple Tight Urban Diamond Interchange (TUDI): This concept would involve reconstructing the existing interchange as a tight diamond, narrowing the median of I-75, relocating Hopple Street to grade-separate the Central Parkway intersection, and constructing a connector road from Central Parkway to MLK Drive.
		This concept would reconstruct the I-74/I-75 interchange to provide higher speed directional ramps to and from I-75 north, closing the existing ramps at Dreman and Colerain Avenues, and improving access to Colerain Avenue and Central Parkway.
	www.i75millcreekexpressway.com /alternatives.htm (2071 words)

	Why the Springfield interchange is special (Site not responding. Last check: 2007-10-12)
		The Springfield interchange is different from most interchanges because three major roads come together at one point.
		When there are two major roads a new kind of interchange needs to be used.
		When there are two major roads and too much traffic for a cloverleaf interchange to handle a directional interchange is used.
	filebox.vt.edu /a/achristo/special.htm (218 words)

	Tight Diamond Interchange (Site not responding. Last check: 2007-10-12)
		The tan shaded areas are the approximate limits of the hillside cuts that would be needed for its construction.
		Unlike the freeway interchange, it requires only one overpass, not two, and would save most of the forest in that area.
		Although this plan is not quite ideal from an environmental point of view, it would still be preferable to the highly destructive freeway interchange that Caltrans has designed.
	hometown.aol.com /mptoybox2/diamond.htm (227 words)

	TecNote 1003 - Flashing New Controller Software
		The "non-standard" interchange below cannot be used with Texas 4-phase operation because the one-way direction of the right-hand frontage road is reversed.
		Therefore, any detector that causes the interchange to leave phase 1 also calls phase 2 to clear the interior of the diamond and progress the traffic through the downstream signal.
		Single ring sequential phasing can be applied to a wide range of interchange and multiple intersection problems when standard 4-phase and 3-phase operation is infeasible, the signals are closely spaced and storage space between the signals is limited.
	www.naztec.com /tecnotes/tn1203.htm (1409 words)

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