Young people at Katherine Lady Berkeley School have received a poignant lesson in road safety.
Sixth form student Izzy Pain, 17, spoke from personal experience when she launched the Drive for Life Event on Wednesday.
Izzy's brother Oliver, 18, lost his life when the car he was driving crashed on a country road at Wick in November 2012.
His friend Harry Smith, 17, who was a passenger, also died in the crash.
Oliver and Harry were the first of four former KLB students who were killed in road traffic collisions from 2012-14.
The school hosted the Drive for Life event in memory of its former pupils, and to spread the safer driving message.
Izzy, 17, told around 300 other sixth formers: "I'm not telling you this to upset you or upset myself. I'm telling you this in hope that you try and take one thing away from this day that you can apply to your driving.
"The last thing I would want is for your younger brother or sister to be stood where I am today, with the same ache in my heart".
Headteacher Andrew Harris said: "It has been an excellent day.
"Our students are clearly enjoying learning from the presentations and activities. And certainly from hearing the questions they have been asking the exhibitors and the conversations they have been having, it has been particularly effective in helping them to think about road safety as both future drivers and road users."
The loss of four former pupils in recent years has had a deep impact on the school.
"For 16 and 17-year-olds to suddenly find that one of their friends is no longer around is extremely difficult," added Mr Harris.
He also praised Izzy for launching the day and speaking in front of 275 sixth form students.
He said: "She was brilliant. It was very moving. She spoke about Oliver and reminded everybody that he was a real person with things that he enjoyed; It was a hard thing for her to do, but gave a point of reference for the whole day."
Drive for Life was organised by Gloucestershire's Road Safety Partnership which is made up of the county's fire and rescue service, Gloucestershire County Council, police and the Police and Crime Commissioner Martin Surl.
Students were given the day off from their usual studies to learn lessons that could save their lives.
Director of operations for the Road Safety Partnership, Steward Edgar, who is also Gloucestershire Fire and Rescue Service's Chief Fire Officer, said: "I've been in my job many years and I've seen the heartache and tragedies arising from unnecessary risks and poor decision-making caused by inexperience. As part of a day of activities and educational workshops, students learnt from members of the emergency services how an investigation develops.
Police family liaison officers also spoke about the 'ripple effect' as they break the news to the victim's family.
