Marsh Gibbon is a village and civil parish in Aylesbury Vale district in Buckinghamshire, England.
 It is close to the A41 and the border with Oxfordshire about 4 mi east of Bicester.
Welsh Government Traffic Officers, (Welsh: "Swyddog Traffig y Llywodraeth Cymru" ), are civilian staff employed by the trunk road agents on behalf of the Welsh Government as a means to ease traffic congestion on major trunk roads in Wales.
 Their role and powers are similar to their English counterparts working for Highways England, the Highways England Traffic Officers.
Robinson Road (Chinese: 罗敏申路) is a major trunk road in Singapore's central business district.
 The road is named after Sir William Cleaver Francis Robinson, the Governor of the Straits Settlements in 1877–1879.
 The land on which Robinson Road now stands was created through land reclamation work started in 1879.
 It was a sea-side thoroughfare until more land reclamation works in Telok Ayer Basin in the early 1900s (completed in 1932) shifted the shoreline further east to make room for the building of Shenton Way.
 This allowed for the road to be widened and converted into a one-way street to accommodate the rise in traffic flow pending massive urban development.
 Today, it is flanked on both sides by major skyscrapers and lends its name to several buildings, including Robinson Centre and Robinson Point.
Trunk roads in Wales were first created in the Trunk Roads Act of 1936 when the UK Ministry of Transport took direct control over 30 of the principal roads in Great Britain from English, Welsh and Scottish local authorities.
 The number of trunk roads were expanded from 30 to 101 in the Trunk Roads Act of 1946.
 These roads formed what the Act called "the national system of routes for through traffic".
 Since Welsh devolution the Trunk Road system in Wales has been managed by the South Wales Trunk Road Agent and North & Mid Wales Trunk Road Agent on behalf of the Welsh Government.
 As of April 2015, out of a total of 34495 mi of roads in Wales, 1576 mi are trunk roads (including 133 mi of motorways and 350 mi of dual carriageway).
The A34 is a major road in England.
 It runs from the A33 and M3 at Winchester in Hampshire, to the A6 and A6042 in Salford.
 It forms a large part of the major trunk route from Southampton, via Oxford, to Birmingham, The Potteries and Manchester.
 For most of its length (together with the A5011 and parts of the A50, and A49), it forms part of the former Winchester-Preston Trunk Road.
 Improvements to the section of road forming the Newbury Bypass around Newbury were the scene of significant direct action environmental protests in the 1990s.
 It is 151 miles (243 km) long.
Rosny Hill Road is a major road in Hobart, Australia.
 Prior to the completion of the Rosny Bypass, Rosny Hill Road (in conjunction with Cambridge Road) was the major Trunk road connecting the city to the airport.
 Today the road provides a link between the Tasman Highway and the suburbs of Bellerive, Rosny and Warrane as well as providing convenient access to Eastlands and Blundstone Arena
The A41 is a major trunk road in England that links London and Birkenhead, although it has now in parts been superseded by motorways.
 It passes through or near various towns and cities including Watford, Kings Langley, Hemel Hempstead, Aylesbury, Solihull, Birmingham, West Bromwich, Wolverhampton, Newport, Whitchurch, Chester and Ellesmere Port.
The South Wales Trunk Road Agent (Welsh: "Asiant Cefnffyrdd De Cymru" ) (SWTRA) is responsible for managing motorways and trunk roads in South Wales on behalf of the Welsh Government.
 The South Wales Trunk Road Agency was established on 1 April 2006, and by 1 April 2012 it was renamed the South Wales Trunk Road Agent.
 The South Wales Trunk Road Agent is responsible for the motorway and trunk roads from the Severn Bridge in the East to Milford Haven in the West.
The A7 is a major trunk road in the United Kingdom, that runs south from Edinburgh in Central Scotland to Carlisle in North West England.
 The A7 meets the M6 motorway close to Carlisle, which runs south to the north west, Midlands and south of England.
 However, the A702 road, which runs further to the north east, and the A74 (M) south, provide a quicker alternative and serve as the main link between Edinburgh and the M6.
The A40 is a major trunk road connecting London to Goodwick (Fishguard), Wales, and officially called The London to Fishguard Trunk Road (A40) in all legal documents and Acts.
 It is 262 mi long.

Question: Which  major trunk road in England is Marsh Gibbon closed to 
Answer: The A41