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''For other roads with the same name see List of A21 roads.'' The A21 is a major trunk road in Southern England and is one of the many connecting London and various commuter towns to the south coast. It provides a link to Hastings, East Sussex and parts of Kent. Half of the distance covered is over difficult terrain, and the hills and bends on the road result in slow-moving traffic, particularly during weekdays on the single carriageway stretches; and during the summer with holiday traffic. Because of this, people have described the A21 as "a joke" and businesspeople have been reported to “hate coming down the A21”.〔 There have been many proposals to upgrade parts of the A21 in response to this. Parts of the A21 follow the turnpike roads: one being the section from Sevenoaks to Tunbridge Wells, opened in 1710; other sections of the road were similarly dealt with later in the century. It is also the location of the first wildlife overbridge in the United Kingdom, near Lamberhurst. The road between the M25 and Hastings is designated a trunk road, and is maintained and managed by Highways England (formerly known as the Highways Agency). The A21 is used for the Maydayrun to Hastings in which motorcyclists ride from South London to the Hastings seafront. It claims to be the largest non-organised event in the UK,〔 attracting over 20,000 bikers. ==Overall view of the road== The A21 begins in Lewisham, almost southeast of the centre of London. Passing through Catford, Bromley and Farnborough, twenty miles (32 km) from the start of the journey, it reaches the Kent border and the open countryside. Shortly afterwards the M25 is reached, which it multiplexes with for about . At this point, the road becomes a trunk road, a distinction it has held since April 1977. Afterwards, the remainder through Kent heads south east for around . This section is mostly a dual carriageway, there are, however, a few short stretches of single carriageway, resulting in frequent congestion, especially in peak periods. After the East Sussex border, the road is mostly a single carriageway route, sometimes with steep gradients. Another bypass takes the A21 around the narrow road through Salehurst and Robertsbridge. Immediately before Hastings is the final hill, almost four miles (6.4 km) in length. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「A21 road (England)」の詳細全文を読む スポンサード リンク
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