Investigations are continuing to establish why a bus carrying teenagers to a theme park crashed in "horrendous" weather in South Lanarkshire.
Natasha Paton, 17, died when the coach plunged off a bridge on the A73 near Biggar on Wednesday. Five others are still in hospital.
Ms Paton's parents have paid tribute to their daughter saying she will be missed by everyone who knew her.
Questions have now been raised about why the trip was allowed to go ahead.
Thirty-nine pupils from Lanark Grammar and five members of staff and the driver were on the coach, heading to Alton Towers in Staffordshire, when it crashed.
Police believe it lost control as it approached a tight bend near the village of Wiston and fell 10ft into the river, crashing through the bridge wall.
The emergency services were forced to rescue the passengers through the coach's sun roof.
Supt Iain Murray, head of road policing for Strathclyde Police, he thought the snow in the area "had a part to play".
Ms Paton is thought to have been thrown from the vehicle then been trapped under it.
In a statement released through police, her parents said: "We are devastated at the loss of our beloved daughter.
"Natasha was a typical teenager and very popular with lots of friends and will be greatly missed by all who knew her".
Tributes from friends have also been posted on the 17-year-old's Bebo page.
Pupils at Lanark Grammar were being offered counselling from education and social work staff and the school chaplain.
The secondary school was open on Thursday for pupils, parents and staff to gather for support.
After the crash a mother whose son was due to go on the trip told BBC News that she had decided not to send him because of the poor weather conditions.
Susan Thornton said: "I just said the roads were too treacherous, that they shouldn't make the journey".
Speaking on BBC Radio Scotland's Good Morning Scotland programme, the general secretary of the Head Teachers Union in Scotland, Ken Cunningham, said organising school outings placed a huge burden on staff.
He said excursions were immensely beneficial for youngsters, but entailed a great deal of work, preparation and risk assessments.
Risk assessments
"No matter how much preparation goes in to these trips, and there is a lot of it, you never know what can go wrong, " he said.
"What I do know is that other schools left to go on similar outings in these conditions yesterday and this is the one that ended in tragedy.
"There are judgements taken by professionals and you have to rely on these judgements. There some things you just can't foresee".
South Lanarkshire Council said it was helping Strathclyde Police with its investigation into the crash.
On Wednesday night, a spokeswoman said: "What we do know is that many of our school buses were out this morning taking children to schools including Lanark Grammar.
"The roads had been gritted throughout the night and the traffic was moving.
"Our thoughts and prayers are with the people of Lanark and the surrounding community and in particular with everyone associated with the school".
BBC News
