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60-581: Powder House Square is a neighborhood and landmark rotary in Somerville, Massachusetts , United States. It is also known locally as Powder House Circle . It is the six-way intersection of College Avenue, Broadway, Warner Street, and Powder House Boulevard. Powder House Square stands at the southern tip of Tufts University 's main Somerville/ Medford campus, and borders the northern edge of Nathan Tufts Park. The square takes its name from

120-416: A pedestrian island for protection that also forces drivers to slow and begin to change direction, encouraging slower, safer speeds. On the island, the pedestrian crossing may become diagonal, to direct the gaze of those crossing into exiting traffic. Physically separated bikeways best protect cyclists. Less optimally, terminating cycle lanes well before roundabout entrances requires cyclists to merge into

180-595: A force of roughly 260 British regulars from the 4th Regiment , under the command of Lieutenant Colonel George Maddison, were rowed in secrecy up the Mystic River from Boston to a landing point near Winter Hill. From there they marched about a mile to the Powder House, and after sunrise removed all of the gunpowder. Most of the regulars then returned to Boston the way they had come, but a small contingent marched on to Cambridge , seizing two field pieces from

240-403: A funeral home. [REDACTED] Media related to Old Powder House (Somerville, Massachusetts) at Wikimedia Commons Roundabout A roundabout , a rotary and a traffic circle are types of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction. In

300-680: A new city seal, featuring the Powder House. Nathan Tufts Park (along with the Powder House) was added to the National Register of Historic Places in 1975, the first of many landmarks in Somerville to be added. The City of Somerville designated the park a local historic district in 1985. An accidental fire damaged the Powder House in 1998, leading to extensive repairs and renovations in 2000–2001. Small bronze sculptured monuments can be seen around Nathan Tufts Park referring to

360-410: A roundabout can reduce delays, because half of the time a full stop would be required. Dedicated left turn signals (in countries where traffic drives on the right) further reduce throughput. Roundabouts can reduce delays for pedestrians compared to traffic signals, because pedestrians are able to cross during any safe gap rather than waiting for a signal. During peak flows when large gaps are infrequent,

420-471: A roundabout potentially leads to less pollution. When entering vehicles only need to give way, they do not always perform a full stop; as a result, by keeping a part of their momentum, the engine will require less work to regain the initial speed, resulting in lower emissions. Research has also shown that slow-moving traffic in roundabouts makes less noise than traffic that must stop and start, speed up and brake. Modern roundabouts were first standardised in

480-514: A tree or tall shrubs. Road signage or flagpoles may be erected at the top of a landscaped mound. Some communities use the island for monuments, the display of large public art or for a fountain. Pedestrians may be prohibited from crossing the circling lane(s). Access to the central island requires an underpass or overpass for safety. Roundabouts have attracted art installations around the world: For larger roundabouts, pedestrian islands at each entry/exit encourage drivers to slow and prepare to enter

540-623: A windmill by John Mallet in the early 1703 or 1704, the Old Powder House was sold to the colonial government of Massachusetts for use as a gunpowder magazine in 1747. It is the oldest stone building in Massachusetts. Located at the intersection of Broadway and College Avenue in present-day Powder House Square, the Old Powder House held the largest supply of gunpowder in the colony. General Thomas Gage , who had become

600-414: Is a type of looping junction in which road traffic travels in one direction around a central island and priority is given to the circulating flow. Signs usually direct traffic entering the circle to slow and to give way to traffic already on it. Because low speeds are required for traffic entering roundabouts, they are physically designed to slow traffic entering the junction to improve safety, so that

660-550: Is approximately one mile from Exit 31 of I-93 . An MBTA station at Ball Square, part of the Green Line Extension project, is a short walk from Powder House Square, making it now within a half mile of the Green Line in addition to the nearby Red Line station at Davis Square . Several businesses thrive on or around Powder House Square, including restaurants, several small medical and dental practices, and

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720-404: Is clear without waiting for a signal to change. Roundabouts can increase delays in locations where traffic would otherwise often not be required to stop. For example, at the junction of a high-volume and a low-volume road, traffic on the busier road would stop only when cross traffic was present, otherwise not having to slow for the roundabout. When the volumes on the roadways are relatively equal,

780-633: Is in common use. In the Channel Islands a third type of roundabout, known as "Filter in Turn", exists. Here approaching drivers neither give way to traffic on the roundabout, as normal, nor have priority over it, but take it in turns to enter from each. Almost all of Jersey 's roundabouts are of this type. In the Philippines , the term rotunda or rotonda is used in referring to roundabouts. The fundamental principle of modern roundabouts

840-439: Is located less than a half mile from Davis Square , Teele Square and Ball Square in Somerville. It is served by MBTA buses 80 (Arlington Center/ Lechmere ) [1] , 89 (Clarendon Hill/ Sullivan Square ) [2] , 94 (Davis Square/Medford Square) [3] , and 96 ( Harvard Station /Medford Square) [4] . Red Line subway service to Harvard Square and downtown Boston is conveniently close at Davis Square Station . Powder House Square

900-476: Is that entering drivers give way to traffic within the roundabout without the need for traffic signals. Conversely, older traffic circles typically require circling drivers to give way to entering traffic. Roundabouts may also have an interior lane. Generally, exiting directly from an inner lane of a multi-lane roundabout is permitted, given that the intersecting road has as many lanes as the roundabout. By contrast, exiting from an inner lane of an older traffic circle

960-424: Is the controversy for drivers that seasoned driving teachers complain about this discomfort a decade after its safety is proven and adoption widespread. The central island may be surrounded by a truck apron that is high enough to discourage drivers from crossing over it, but low enough to allow wide or long vehicles to navigate the roundabout. The island may provide a visual barrier, to alert approaching drivers to

1020-497: Is usually not permitted and traffic must first move into the outside lane. Vehicles circulate around the central island in one direction at speeds of 25–40 km/h (15–25 mph). In left-hand traffic countries they circulate clockwise (looking from above); in right-hand traffic, anticlockwise. Multi-lane roundabouts are typically less than 75 metres (250 ft) in diameter; older traffic circles and roundabout interchanges may be considerably larger. Roundabouts are roughly

1080-675: The Cambridge Common . The field pieces and powder were then taken from Boston to the British stronghold on Castle Island , then known as Castle William (renamed Fort Independence in 1779). In response to the raid, amid rumors that blood had been shed, alarm spread through the countryside as far as Connecticut and beyond, and American Patriots sprang into action, fearing that war was at hand. Thousands of militiamen began streaming toward Boston and Cambridge , and mob action forced Loyalists and some government officials to flee to

1140-716: The Mystic River , succeeding Philip Drinker in that role. This ferry, later known as the Penny Ferry, served the inhabitants of Malden and the upper towns until 1787 when it was superseded by the Malden Bridge. Tufts' involvement in the Salem witch trials was thus described in the 1889 History of Malden : Tufts was recorded as a Freeman of Malden and the Massachusetts Bay Colony May 3, 1665 and October 15, 1679 (NEHGS "Register"). Peter Tufts

1200-497: The 17th century. Originally called "Menotomie's Road," it ran from Charlestown to the settlement at Menotomy (present-day Arlington ). Powder House Boulevard was created in 1900, extending northwest from Broadway at Nathan Tufts Park. According to a plaque placed at the center of the rotary island, the circle was dedicated in 1940 as the James A. Reynolds Traffic Circle, in honor of a Tufts College professor. First built for use as

1260-551: The 18th century Powder House, which overlooks the rotary from Nathan Tufts Park. Powder House Square was home to one of the first hostile acts of the American Revolution . The removal of colonial gunpowder by British soldiers, and the massive popular reaction known as Powder Alarm that ensued, are considered to be a turning point in the events leading up to war. Broadway was one of the earliest highways running through what would later become Somerville, originating in

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1320-489: The 1950s, and some were removed. Widespread use of the modern roundabout began when the UK's Transport Research Laboratory engineers re-engineered and standardised circular intersections during the 1960s. Frank Blackmore led the development of the "priority rule" and subsequently invented the mini-roundabout to overcome capacity and safety limitations. The priority rule was found to improve traffic flow by up to 10%. In 1966,

1380-680: The Powder House Farm along with its namesake structure to the city in 1890, and from this Nathan Tufts Park was established in 1893. The Field House was constructed in 1935-36 using stones from the 1934-demolished Somerville Highlands railroad station, which had closed in 1927 when passenger service on the Fitchburg Cutoff ended. Sponsored by the Federal Relief Administration as a Work Projects Administration Project, it has served many purposes over

1440-572: The UK in 1966 and were found to be a significant improvement over previous traffic circles and rotaries. Since then, modern roundabouts have become commonplace throughout the world, including Australia, the United Kingdom and France. Circular junctions existed before roundabouts, including: Although some may still be referred to as roundabouts , the operating and entry characteristics of these traffic circles differed considerably from modern roundabouts. Circular intersections were built in

1500-628: The US. Research on Australian roundabouts was conducted in the 1980s at the Australian Road Research Board (ARRB). Its analytical capacity and performance models differ from the TRL model significantly, following a lane-based gap-acceptance theory including geometric parameters. Peter Tufts Peter Tufts (also spelled "Tuffts," Tuffes," and "Turfs") immigrated from Wilby, Norfolk, England to Charlestown, Massachusetts , which at

1560-590: The USA, engineers use the term modern roundabout to refer to junctions installed after 1960 that incorporate various design rules to increase safety. Compared to stop signs, traffic signals, and earlier forms of roundabouts, modern roundabouts reduce the likelihood and severity of collisions greatly by reducing traffic speeds and minimizing T-bone and head-on collisions . Variations on the basic concept include integration with tram or train lines, two-way flow, higher speeds and many others. For pedestrians, traffic exiting

1620-538: The United Kingdom adopted a rule at all circular junctions that required entering traffic to give way to circulating traffic. A Transportation Research Board guide reports that the modern roundabout represents a significant improvement, in terms of both operations and safety, when compared with older rotaries and traffic circles. The design became mandatory in the United Kingdom for all new roundabouts in November 1966. Australia and other British-influenced countries were

1680-844: The United Kingdom in the 1960s. In the mid-2010s, about 3% of the then circa 4,000 U.S. modern roundabouts were located in Carmel, Indiana , whose mayor James Brainard had been actively promoting their construction; because of increased safety, injuries caused by car accidents in the city dropped by 80% after 1996. As of December 2015 there were about 4,800 modern roundabouts in the United States. As an example, Washington state contained about 120 roundabouts as of October 2016 , all having been built since 1997, with more planned. The first Canadian traffic circles were in Edmonton. There were 7 such by 1954. However, they didn't gain popularity in

1740-401: The United Kingdom. A roundabout is also a traditional English name given to amusement rides known as a carousel , or a merry-go-round in other English-speaking countries. In U.S. dictionaries the terms roundabout , traffic circle , road circle and rotary are synonyms. However, several experts such as Leif Ourston have stressed the need to distinguish between the characteristics of

1800-425: The United States, though many were large-diameter 'rotaries' that enabled high-speed merge and weave manoeuvres. Older-style traffic circles may control entering traffic by stop signs or traffic lights. Many allow entry at higher speeds without deflection, or require a stop and a 90-degree turn to enter. Because these circumstances caused a lot of vehicle collisions, construction of traffic circles and rotaries ceased in

1860-826: The approaches. Many traffic circles have been converted to modern roundabouts, including the former Kingston traffic circle in New York and several in New Jersey. Others have been converted to signalised intersections, such as the Drum Hill Rotary in Chelmsford, Massachusetts , which is now six lanes wide and controlled by four separate intersections. Japan was first introduced to roundabouts in September 2014 to stop major accidents and traffic jams. The word roundabout dates from early 20th-century use in

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1920-496: The circle. They also provide a refuge where pedestrians may pause mid-crossing. Vehicles or bicycles entering or exiting the roundabout must yield to all traffic including pedestrians. Pedestrian crossings at each entry/exit may be located at least one full car length outside the circle. The extra space allows pedestrians to cross behind vehicles waiting to enter the circle, and to allow exiting vehicles to stop for pedestrians without obstruction. Each pedestrian crossing may traverse

1980-558: The exit arms of the motorised roundabout, priority must be established. In the Netherlands, cyclists will normally be given priority to promote cycling over driving. As well as their use in the Netherlands and Denmark, these designs have been subsequently built in the United Kingdom and Ireland. The capacity of a roundabout varies based on entry angle, lane width, and the number of entry and circulating lanes. As with other types of junctions, operational performance depends heavily on

2040-466: The first outside the UK to build modern roundabouts. In the United States modern roundabouts emerged in the 1990s after years of planning and educational campaigning by Frank Blackmore and Leif Ourston , who sought to bring the by then well-established increased safety and traffic flow in other countries to America. The first was constructed in Summerlin, Nevada , in 1990 and was followed by another

2100-449: The flow volumes from various approaches. A single-lane roundabout can handle approximately 20,000–26,000 vehicles per day, while a two-lane design supports 40,000 to 50,000. Under many traffic conditions, a roundabout operates with less delay than signalised or all-way stop approaches. Roundabouts do not stop all entering vehicles, reducing both individual and queuing delays. Throughput further improves because drivers proceed when traffic

2160-471: The following year. This roundabout occasioned dismay from residents, and a local news program said about it, "Even police agree, [roundabouts] can be confusing at times." Between 1990 and 1995, numerous modern roundabouts were built in California, Colorado, Florida, Maryland, Nevada, and Vermont. Municipalities introducing new roundabouts often were met with some degree of public resistance, just as in

2220-528: The land containing the Powder House to Peter Tufts in 1818. The estate, known as the Powder House Farm, was used as a farm and residence for the Tufts family for most of the 19th century, passing to Peter's heir, Nathan Tufts. Incidentally, another Tufts relative Charles Tufts donated the land across Broadway on the Somerville/Medford line to found Tufts College (now Tufts University ). The college

2280-665: The military governor of Massachusetts in May 1774, was charged with enforcement of the highly unpopular Intolerable Acts , which the British Parliament had passed in response to the Boston Tea Party . Seeking to prevent the outbreak of war, he believed that the best way to accomplish this was by secretly removing military stores from storehouses and arsenals in New England . Just after dawn on September 1, 1774,

2340-435: The modern roundabout and the nonconforming traffic circle: The U.S. Department of Transportation adopted the term modern roundabout to distinguish those that require entering drivers to give way to others. Many old traffic circles remain in the northeastern US . Some modern roundabouts are elongated to encompass additional streets, but traffic always flows in a loop. In the United States, traffic engineers typically use

2400-545: The most, by -47% to -84% for the aforementioned heights. The level of irritation to drivers is not to be understated, as it is the crucial point of the design: to force drivers to pay attention to the sides of the driving direction. This leads to drivers complaining about these designs, as Denmark in most regards embraces designing road infrastructure, such that the wanted driving behaviour leads to comfort i.e., lane width corresponding to speed limit and obstacles encouraging slowdown near points of safety concern such as schools. Such

2460-460: The obstacles have been found to discomfort drivers more so than the roundabout itself compared to conventional intersections, thus initiating further observation and care taking of the driver. In Denmark, it was found to decrease accidents in roundabouts by 27% to 84% depending on height and type. In studies, heights of 0-0.9, 1-1.9 and 2+ metres were evaluated. It was found that for all heights, especially accidents leading to human injuries were reduced

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2520-427: The path of an exiting vehicle is relatively straight, and so the motorist may often not slow substantially. To give way to a cyclist on the outside requires the exiting motorist to look toward the rear, to the perimeter. Other vehicles can obstruct the driver's view in this direction, complicating the motorist's task. The more frequent requirements for motorists to slow or stop reduce traffic flow. A 1992 study found that

2580-400: The presence of the roundabout, and to encourage drivers to focus on the traffic in the path of the circle. A visual barrier significantly reduces the accident rate. Otherwise, vehicles anywhere in or near the circle can cause those entering to stop and wait for them to pass, even if they are opposite, which unnecessarily reduces traffic flow. The barrier may be a landscaped mound, a raised wall,

2640-536: The protection of the British Army . This action provided a "dress rehearsal" for the Battles of Lexington and Concord seven months later in the famous "shot heard 'round the world". This did however, inflame already heated feelings on both sides and would spur actions by both British and American forces to move both powder and cannons to secure locations. Massachusetts began storing gunpowder elsewhere and sold

2700-586: The rest of the country until the 1990s. They became increasingly popular amongst traffic planners and civil engineers in the 15 years thereafter due to their success in Europe. By 2014 there were about 400 roundabouts in Canada at the time (most in Quebec, Alberta, British Columbia and Ontario), or one per 90,000 inhabitants (compared to one per 84,000 inhabitants in the United States that year). A " modern roundabout"

2760-559: The risk to cyclists is high in all such intersections, but much higher when the junction has a marked bicycle lane or sidepath around its perimeter. Cycle lanes were installed at Museum Road, Portsmouth , but were replaced by a narrowed carriageway to encourage lane sharing. The roundabout at the Brown Road and Loop 202 interchange in Mesa, Arizona , adopts a U.S.-recommended design. On-street pavement markings direct cyclists to enter

2820-483: The roads typically approach the junction radially ; whereas older-style traffic circles may be designed to try to increase speeds, and have roads that enter the circle tangentially . Roundabouts are normally not used on controlled-access highways because of the low speed requirement, but may be used on lower grades of highway such as limited-access roads . When such roads are redesigned to incorporate roundabouts, traffic speeds must be reduced via tricks such as curving

2880-614: The rotary always has the right of way. For instance, in Massachusetts , "Any operator of a vehicle entering a rotary intersection shall yield the right-of-way to any vehicle already in the intersection." In Rhode Island entering vehicles "Yield to vehicles in the roundabout." In the dialect used in the Scottish city of Dundee , circle is used to refer to roundabouts. In the English West Midlands , island

2940-605: The roundabout comes from one direction, instead of three, simplifying the pedestrian's visual environment. Traffic moves slowly enough to allow visual engagement with pedestrians, encouraging deference towards them. Other benefits include reduced driver confusion associated with perpendicular junctions and reduced queuing associated with traffic lights . They allow U-turns within the normal flow of traffic, which often are not possible at other forms of junction. Moreover, since vehicles that run on gasoline typically spend less time idling at roundabouts than at signalled intersections, using

3000-436: The same size as signalled intersections of the same capacity. Design criteria include: Modern roundabouts feature a central island and sometimes pedestrian islands at each entry or exit often for decoration. Denmark has begun widespread adoption of particular high islands, or if not possible, obstacles such as hedges or a ring of trees in larger examples. This is done to further increase the safety benefits of roundabouts, as

3060-488: The sidewalk at the end of the bike lane. Cyclists who choose to travel on the wide sidewalk, cross roundabout arms perpendicularly, well outside the circle. A pedestrian island allows pedestrians and cyclists to cross one lane at a time. Protected roundabouts (or Dutch roundabout) were developed in the Netherlands , with cyclists separated from vehicles using dedicated lanes. As cyclists will conflict with motorists at

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3120-415: The site's past uses as a farm, a mill, storage for gunpowder, and even a pickle factory. The island within the actual traffic circle is a tiny park on its own, complete with walkways, benches, and neatly arranged bushes and other flora. There is a large 360 degree directional post that points in the direction of dozens of different communities (like Arlington, Medford, and Winchester ). Powder House Square

3180-616: The slower speed of traffic entering and exiting can still allow crossing, despite the smaller gaps. Studies of roundabouts that replaced stop signs and/or traffic signals found that vehicle delays were reduced 13–89 percent and the proportion of vehicles that stopped was reduced 14–56 percent. Delays on major approaches increased as vehicles slowed to enter the roundabouts. Roundabouts have been found to reduce carbon monoxide emissions by 15–45 percent, nitrous oxide emissions by 21–44 percent, carbon dioxide emissions by 23–37 percent and hydrocarbon emissions by 0–42 percent. Fuel consumption

3240-407: The stream of motor traffic, but keeps cyclists in full view of drivers, at some cost in motor vehicle speed. Cyclists may also be permitted to use pedestrian crossings. Traditional cycle lanes increase vehicle–bicycle collisions. When exiting, a motorist must look ahead to avoid colliding with another vehicle or with pedestrians on a pedestrian crossing. As the intersection curves away from the exit,

3300-432: The term rotary for large-scale circular junctions between expressways or controlled-access highways . Rotaries of this type typically feature high speeds inside the circle and on the approaches. In the United States' New England region, however, a " rotary " is typically used as the general term for all roundabouts, including those with modern designs. State laws in these states mandate that traffic already driving in

3360-474: The time included the present day cities of Somerville , Malden (then known as "Mystic Side"), and Medford . He is recorded in 1637 "on the Malden side (of Charlestown)." By 1638 he owned 43 acres (17 ha) there. By 1647 Peter was living at "Mystic Side," two years later to be incorporated as Malden, Massachusetts . In early 1647 Peter, along with William Bridge, became ferryman at Charlestown Neck on

3420-593: The years, including as an office for the Draft Board, then for the Traffic and Parking Department, and most recently as a Youth Program center. The building underwent significant repairs and restoration work both inside and outside during 2001–2002, and is now available for public use by petition. In celebration of its 100th birthday, the City of Somerville (whose seal had previously depicted George Washington ) created

3480-505: Was founded in 1852, on Walnut Hill slightly to the north of present-day Powder House Square. In the 1870s, a pickle and condiment manufacturer named George Emerson began making pickles nearby, housing his business in a large shed that he moved to the property from another location in Somerville. The powder house itself, with its two-foot thick stone walls, was well-insulated and made a perfect place for storing Emerson's "Old Powder House Brand" pickles. The descendants of Nathan Tufts donated

3540-697: Was reduced by an estimated 23–34 percent. Many countries have researched roundabout capacity. The software can help calculate capacity, delay and queues. Packages include ARCADY , Rodel, Highway Capacity Software and Sidra Intersection . ARCADY and Rodel are based on the Transport Research Laboratory mathematical model. The TRL approach is derived from empirical models based on geometric parameters and observed driver behaviour with regard to lane choice. Sidra Intersection software includes roundabout capacity models developed in Australia and

3600-860: Was the first representative from Medford to the Massachusetts General Court in 1689, however it is unclear whether this was Peter Tufts, Sr. (then 72), or his firstborn son Captain Peter Tufts (then 41). Around 1678, the elder Peter Tufts built the Peter Tufts House in Medford, which was then given to his first son, the younger Captain Peter Tufts. His will is recorded in Middlesex County, Massachusetts as #22994, dated March 1, 1693 with codicils of July 8, 1695 and June 13, 1698, and executed June 10, 1701. He

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