"I'm not against the use of the hard shoulder at peak times", she said.

BBC: M1 motorway between junctions 32 and 33

As Johnson and other technical analysts see it, the left shoulder is the 1998 high, the head the early 2000 peak, and the right shoulder is the high reached earlier this year.

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The market rises to a peak, then falls, which is considered the left shoulder.

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As we entered Maryland she was nearing 90 mph on the shoulder of the road passing cars as if they were standing still as rush hour was nearing its peak.

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The hard shoulder would be in use 24 hours a day, unlike other schemes in England which restrict use to peak hours.

BBC: M1 motorway between junctions 32 and 33