Alton Towers crash: 'Lessons learned' says theme parkpublished at 14:20
Allen Cook
BBC Local Live
Alton Towers says it is confident "lessons have been learned" after announcing its investigation had found human error caused the rollercoaster crash in June.
Speaking in September, Victoria Balch said the ride collided with empty carriage in front several times.
When the Smiler re-opens next year, it will feature an additional level of authorisation so no manual override can happen without a senior member of staff, the theme park said.