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The M10 was a motorway in Hertfordshire, England, running for approximately 3 miles (4.5 km) from the M1 motorway at junction 7 near Hemel Hempstead to the A414 North Orbital Road at Park Street Roundabout, just south of St Albans. Opened in 1959, it was reclassified as part of the A414 in 2009. ==History== The M10 opened on 2 November 1959 along with the M1 and M45, and was designed and constructed by Tarmac Construction〔(Motorway archive list of material held by Northamptonshire CC )〕 as part of the St Albans bypass (along with the M1 between junctions 5 and 10a).〔(The Motorway Archive )〕 At the time, the M1's southern terminus was at junction 5 at Berrygrove, with the main route from there to the A1 in London being via the A41 Watford Bypass. Since the capacity of the A roads was much less than that of the motorway, a distributing spur was required to split up the traffic and reduce congestion at Berrygrove. The M10 was thus built to distribute southbound traffic on the M1〔(CBRD Motorway Database – M10 )〕 onto the A5 (now A5183) and, as an alternative, via the North Orbital Road and the A6 to the A1 Barnet Bypass. The M45 was the equivalent distributing spur at the northern end of the M1, and is thus regarded as a sister motorway to the M10. In later years, as the M1 was extended southwards into London and the M25 was built, the M10's original purpose eroded. It was sometimes suggested that the motorway might have been extended to meet the M25 at junction 22, but this was never proposed.〔(Roads UK – M10: A Short Spur With a Long History )〕 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「M10 motorway (Great Britain)」の詳細全文を読む スポンサード リンク
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