The young Slough woman was one of five people in a blue Volkswagen Golf which mounted a roundabout and rolled onto its roof at about 2.30am Saturday on the A413 Amersham Road, Chalfont St Peter.
Detectives closed the road between A40 Oxford Road and The Greyhound Inn at Joiners Lane roundabout for more than 10 hours as they investigated the deadly smash.
It was reopened at midday.
Early reports indicate the car was being driven south before losing control at the roundabout junction with Kingsway.
Miss Kaur was pronounced dead at the scene.
Three other passengers were taken to hospital with another person suffering minor injuries not requiring hospital treatment.
One of the injured people remained in St Mary’s Hospital in London yesterday (Thursday)with serious injuries, while the other two have since been discharged.
Simran was a former pupil at Beechwood School in Long Readings Lane, Britwell where she is fondly remembered.
Headteacher Kathleen Higgins said: “We were deeply shocked and saddened to hear the tragic news about Simran and we send our heartfelt condolences to her family and friends.
“Simran was a wonderful young woman. During her time at Beechwood she was a very popular and highly regarded member of our school community which is testament to her truly lovely personality and character.”
It is understood Simran also studied childcare at Langley College.
Heartbroken friends have gone onto social media to express their distress over the death of a ‘happy and bubbly’ young woman who loved to dance.
Investigating officer PC Simon Nelson, of the Serious Collision Investigation Unit, based at Three Mile Cross, appealed for anyone who witnessed the crash or saw the car before it happened to come forward.
He said: “I would also ask any drivers with dash-cams to please review their footage in case it has captured anything relevant.”
Anyone who can help is asked to call the 24-hour non-emergency number 101, quoting reference 43200319014, make a report online or call Crimestoppers on 0800 555 111.