Williams test driver Susie Wolff is to retire from motorsport.The Scot - the first woman to take part in a grand prix weekend for more than 20 years - believes her aim of racing in Formula 1 "isn't going to happen".
"I got so close and I fought hard. But my gut feeling tells me it is time to move on to explore new challenges," Wolff, 32, said.
"As a sports person it is always difficult to know when to stop but for me this journey has come to an end."
She started working with Williams in 2012, after racing for seven years in the German Touring Car Championship.
An initial trial in the car developed into a full-time test and development role and she took part in four practice sessions at grands prix over the past two seasons, alongside work in test sessions and in the team's simulator.
Williams deputy team principal Claire Williams said: "It has been a pleasure to work with Susie over the years and see her develop as a driver within the team.
"Her feedback and knowledge of the car has been an important part of our recent development and we will be sorry to see her go."
Women 'can race in F1'As the only female racing driver with close links to F1, Wolff became a figurehead.
She said: "My progression into F1 came to represent so much more than a racing driver simply trying to reach the pinnacle of the sport.
"It was also the hope that finally there may again be a female on the starting grid. I rode the wave, was energised by all the support and fought hard. There were those who wanted it to happen. Those who didn't."
Wolff said she had given her all in her attempt to secure a race seat.
She added: "Do I think F1 is ready for a competitive female racing driver that can perform at the highest level? Yes. Do I think it is achievable as a woman? Most definitely. Do I think it will happen soon? Sadly, no.
"We have two issues - not enough young girls starting in karting at a young age and no clear role model. Sometimes you just have to see it to believe it."
What next for Wolff?Wolff says she wants to try to help the next generation of women make it in motorsport.
"I want to give something back," she said as she prepares to link up with the Motor Sports Association, the UK motorsport authority.
"I dared to be different, I want to inspire others to do the same."
Will she retain a role in F1?Wolff is married to Toto Wolff, the boss of the world champion Mercedes F1 team.
But she says she is unlikely to continue to have an active role in the sport.
"I will attend some races as Toto's wife and a friend of the Williams team but I don't want to be absorbed by F1 like I am now," she told BBC Sport.
"I want to leave completely and give myself room and space to move on to something else. I have a great platform behind me and I will use it in a positive way.
"I'm still young and I want to go on and find that next passion in life so I can wake up every day with a purpose."