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26-712: 42°58′13.91″S 147°18′34.78″E  /  42.9705306°S 147.3096611°E  / -42.9705306; 147.3096611 The Kingston Interchange is a hybrid four way interchange incorporating a roundabout and elements of a trumpet interchange . It connects the Southern Outlet with the Huon Highway and the Channel Highway at Kingston , within the greater area of Hobart , Tasmania . The Kingston Interchange has recently been upgraded to address safety problems associated with right-turn movements at

52-658: A rotary interchange , which uses a rotary rather than a roundabout. Roundabouts may also be used in conjunction with other interchange types such as a standard or folded diamond interchange , but such use should not be confused with a roundabout interchange. Roundabout interchanges are extremely common in the United Kingdom and Ireland with hundreds on the motorway network alone. However, recent cost cutting has meant that dumbbell interchanges are increasingly used instead. These are essentially diamond interchanges with roundabouts instead of signals or stop signs where

78-512: A lorry park until the ferries and/or Channel Tunnel are fully running again. Operation Brock was the replacement for Stack, to be used in the event of no-deal Brexit . In July 2020, the government announced that it had bought a site beside junction 10A to build the Sevington customs clearance facility and lorry park . Data from driver location signs are used to provide distance in kilometres and carriageway identifier information. Where

104-796: Is a motorway in Kent , England. It follows on from the A20 at Swanley , meeting the M25 , and continuing on to Folkestone , providing a link to the Channel Tunnel and the ports at Dover . It is 50.6 miles (81.4 km) long. Although not signposted in England, this road is part of the European route E15 . It is also used as a holding area for goods traffic when traffic across the English Channel

130-1166: Is a variation on the roundabout interchange in which both roads are grade-separated. It is similar to the three-level diamond interchange except that the small square of that latter interchange is enlarged to a true roundabout. If the roundabout is sufficiently large, the interchange may require only two levels. Three-level stacked roundabouts are quite common in Britain because they use less land than other four-way junctions where both roads are grade separated. However, they have lower capacity for turning movements – some have had direct-linking slip roads added later in an attempt to solve this problem. Examples of such junctions are found at Lofthouse, West Yorkshire ( M1 / M62 ; 53°43′55″N 1°30′47″W  /  53.73194°N 1.51306°W  / 53.73194; -1.51306  ( Lofthouse, West Yorkshire ) ) and Swanley , Kent ( M20 / M25 ; 51°23′19″N 0°11′38″E  /  51.38861°N 0.19389°E  / 51.38861; 0.19389  ( Swanley, Kent ) ). Download coordinates as: M20 motorway The M20

156-700: Is crossed by the Ashford and HS1 railway lines before becoming the Ashford bypass. Travelling past Brabourne Lees it is once again joined by HS1 and the East Stour . Just north of Saltwood it reaches the Channel Tunnel terminal and is crossed by HS1 for the last time. The final section runs along the northern suburbs of Folkestone. The M20 was, in common with many United Kingdom motorways, opened in stages: Junctions 5 to 7 opened in 1960. One end

182-614: Is disrupted, such as Operation Stack and Operation Brock . The road starts at its junction with the M25 motorway and A20 road just east of Swanley , then continues south east across the River Darent , north of Farningham through the North Downs , past West Kingsdown and Wrotham to meet the M26 . It then strikes east, running north of Addington . When it reaches junction 4 it passes south of New Hythe and runs parallel to

208-571: The Medway Valley railway line before crossing it close to junction 5. This next section is the Maidstone bypass . The High Speed 1 (HS1) railway line then runs parallel to the motorway as it continues to the north of Bearsted , crosses the Swanley to Ashford (via Maidstone East) line then out into the countryside alongside Leeds Castle . Proceeding south of Lenham and Charing it

234-618: The Medway cost £200,000. The section opened on 3 December 1960. Coldharbour Lane was widened to 33 feet (10 m), with a roundabout on the A20, with a terminus of the A20(M) 0.5 miles (0.80 km) north along Coldharbour Lane (junction 5). It was the south of England's first motorway. These sections of the M20 were known as the 'Maidstone Bypass'. This road was then numbered as the A20(M) as it bypassed

260-674: The A2070 at Ashford in Kent, east of junction 10, to support the development of South Ashford which has been identified as a growth area in the South East. In May 2012, it was announced that the scheme would be postponed for the short-term future. Planning recommenced in 2016. Work started on building the scheme in January 2018, with works planned to complete in May 2020. The coast-facing sliproads at

286-611: The A229 with a temporary terminus on the A2011. Junctions 7 to 8 opened in 1961 from the A229 to Coldharbour Lane. It was 1.5 miles (2.4 km), to take 15   months, planned for October 1960. The contract of £822,928 in March 1959 was given to Sir Robert McAlpine. Piles were constructed by West's Piling & Construction, of Harmondsworth . Work was started on Monday 13 April 1959 by Harold Watkinson near Cobtree Manor. The bridge across

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312-503: The Highways Agency having declared that the northern part of the bridge was structurally intact. However this section of the motorway was again closed on the weekend of 3 and 4 September 2016 for the demolition and clearance of the northern bridge element. A replacement pedestrian and cycle bridge was opened in March 2021 at a cost of around £1.5 million. The Highways Agency proposed a new M20 junction 10a and link road to

338-464: The M1 had started. It was one of three main motorway projects started in 1958. The section was intended to open on 27 March 1960, but was late. On Wednesday 1 June 1960, 5 miles (8.0 km) was opened at Forstal (A229) by Sir Leslie Doubleday, chairman of Kent County Council. Maidstone already had a bypass – the A2011, which largely followed the A20(M) bypass. There was a short section of the A20(M) west of

364-405: The bypass is still visible as the bridge was not reconstructed when the motorway was constructed. This section of motorway has no hard shoulder indicating the smaller width of the old bypass. This left the motorway in two sections, with the 14-mile (23 km) gap running via the A20 – this was referred to locally as 'The Missing Link'. The level of traffic was not considered necessary to complete

390-468: The existing Junction 10 were closed to allow the final works on the London-facing sliproads at Junction 10a and the new junction opened on 31 October 2019. Since the opening of the Channel Tunnel, sections of the M20 have been used occasionally for the implementation of Operation Stack, should the ferries and/or Channel Tunnel stop running. This closes that part of the motorway and uses the area as

416-517: The former Drum Hill Rotary (now Drum Hill Square) in Chelmsford, Massachusetts , in New England , where such interchanges are unusually common. A divided diamond , in which the minor road is separated into four intersections, rather than two, also acts like a roundabout interchange, but it is more square in shape and, typically, has traffic light control. The three-level stacked roundabout

442-445: The incident, the southern section of the bridge – which rested on a plinth south of the motorway and the cantilevered northern section – was dislodged and fell onto the carriageway below, landing on the trailer of a passing HGV and being narrowly avoided by a motorcyclist who suffered broken ribs taking avoiding action. Both carriageways of the motorway were closed to enable the removal of the broken section. The motorway reopened with

468-401: The interchange. The interchange modifications included: The Department of Infrastructure, Energy and Resources also upgraded the interchange with the intention of providing a dual-carriage highway south of the interchange some time in the future ( see Kingston Bypass ). [REDACTED] Australian Roads portal Roundabout interchange A roundabout interchange is similar to

494-478: The junction 8 to 9 section, the M20 was three lanes either side of the original A20(M) section. This was a bottleneck , so it was decided to widen this section of motorway. The road here was increased to a dual three- or four-lane road with two-lane distributor roads either side. This section was opened in 1995. To the north of Maidstone, there is an overlap between the slip roads for junctions 5 (A20) and 6 (A229). Between 2006 and 2007, junction 10 near Ashford

520-511: The route. Most of the traffic for the Channel ports was using the A2 / M2 route. When the Channel Tunnel was ready for construction, it was decided to complete the M20 between junctions 8 and 9 and this opened in 1991. Concurrent to this was the extension to Dover as part of the A20 which opened in 1993. A new junction 11A was also constructed to serve the Channel Tunnel. Following completion of

546-525: The slip roads meet the minor road. They are cheaper than roundabout interchanges as only one bridge is required instead of two. Roundabout interchanges are much less common in North America but have been built more frequently since 1995, to improve safety, and to reduce traffic delays and bridge widening costs. However, many of the older and more dangerous rotary -style overpass interchanges have been signalized to improve throughput and safety, such as

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572-507: The stretch of A20 through Maidstone which was renumbered A2020 . This was the first stretch of motorway to open south of London. Plans for a bypass of Maidstone had existed since the 1930s, originally as an all-purpose project, before being upgraded to motorway standard in the 1950s. When the motorway was extended westwards towards London in the 1970s, it was renamed M20 and the A2020 reverted to A20. The section around Ashford (junctions 9–10)

598-460: Was introduced in West Kent between junctions 4 and 7, with variable speed limits. In August 2016, part of a pedestrian footbridge connecting areas of Ryarsh divided by the motorway was brought down – initially suspected to be the result of an impact by a digger from nearby works to widen the southbound bridge at junction 4 being carried on a low-loader that was moving along the hard shoulder. In

624-421: Was near the 'Old England' pub on the A20 at Hollingbourne Corner, junction 8, a temporary terminus until 1992, to the A229. It would be £1.5   million for the eastern section 5.25 miles (8.4 km), to open by the end of March 1960, built by Costain, designed by Scott Wilson. Work was started at Hollingbourne on Monday 5 May 1958 by Richard Nugent, Baron Nugent of Guildford , this was only five weeks after

650-519: Was originally the A20 Ashford Bypass with actual construction having started before World War 2 – although the route itself was not opened until 19 July 1957. The bypass started at Willesborough near the current location of junction 10 and terminated south of the existing junction 9 at the current Drover's Roundabout. A section of the old bypass is still visible now named Simone Weil Avenue. The original bridge that brought Canterbury Road over

676-566: Was remodelled to increase capacity when the bridges across the motorway were modified to provide three lanes of traffic at the roundabout, and local approach roads were widened, with new traffic lights to control traffic flows at the junction between the A292 Hythe Road and the London-bound M20 entry slip road. A new footbridge was also constructed across the motorway. The cost was £4.9 million. A Controlled motorway scheme

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