The first hard shoulder running scheme was introduced on the M42 in the West Midlands in 2006.

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In Warwickshire, the M40 was blocked and there was slow traffic at junction 3a for the M42.

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An investigation is under way into whether another vehicle was involved on the M42, a Warwickshire police spokesman said.

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The grey Mitsubishi Colt was first spotted on motorway cameras near the interchange between the M42 and the M5.

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The first new rail line would take it from Water Orton, following a route near to the M42 towards Nottingham.

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Another of the terminal's great subterranean secrets is M42 -- a hidden basement and the deepest accessible underground point in Manhattan.

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The BBC has spoken to one solicitor who is challenging a conviction for a client caught speeding on the M42 last April.

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The accident closed the M42 northbound between junction 7A and junction 9, and the M6 Toll northbound between junction T1 and the M42.

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And he warned that the signage planned for the scheme on the M1 "was not of the standard you have around the M42".

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Highways Agency spokesman Andrew Page-Dove said a similar project on the M42 had been "a real success" with improved traffic flow along the motorway.

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Mr Darling said new technology was already being used to "better manage roadspace" - for example a new system of "traffic management " on the M42.

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