Safety measures at Alton Towers were "not adequate", the company's chief executive has admitted as he defended the closure of three other rides across the country after a crash on ride The Smiler.
Four people were seriously injured when the ride smashed into an empty car left on the tracks.
Nick Varney, who runs Merlin Entertainments, said he wanted to be able to "look everybody in the eye" and assure visitors they were not at risk.
He revealed the theme park company was adding "another layer" of safety measures to existing rides as a "precaution" against future accidents.
(Safety measures) clearly weren't adequate on Smiler, because the accident happened. We have taken steps to upgrade safety standards from what were already very stringent safety standards.
I want to be able to look everybody in the eye and promise them when they come to our parks and get on our rides that they are safe.
I think we have had very rigorous protocols across all our attractions. We have had the first - and I hope only accident - in one of our theme parks. We have to make sure that doesn't happen again.
The park has been closed since the crash on Tuesday, at an estimated cost of £500,000 a day.
The boyfriend of a teenager who had her leg amputated after a rollercoaster crash says the theme park should have shut down the ride.
Details of the rides that have been halted and what to do if you have tickets for Alton Towers.
A man who witnessed the rollercoaster crash at Alton Towers told ITV News he raised concerns about a carriage on the track but was ignored.