Alton Towers' new roller-coaster, billed as the first of its kind in the world, will preview today, ahead of its opening on May 23.
'The Smiler' cost £18 million to build, has a drop of 30 metres and a maximum speed of 52 miles per hour.
The ride is the world's first 14 looping roller-coaster.
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It will be largely dry but some fog may be slow to clear.
Any fog patches slow to clear during the morning.
The Fire and Rescue service were called to Lynmouth Close in Leicester on Friday night.