Bus drivers across Sheffield are being trained to spot the warning signs of child sexual exploitation.
The partnership between South Yorkshire Police and First Bus will help advise drivers on what to look out for and how to report any suspicious behaviour to police.
Dozens of drivers took part in the first training session as part of an initiative to help them play a role in reporting concerns.
First buses will also display A3 posters.
Sgt Katherine Wallis, who delivers the training, said: “Young people regularly travel via public transport so it is vital that drivers know what to look out for and how to report concerns.
“The scheme will hopefully empower them to raise concerns at an early stage which allows police and other agencies to prevent harm and take action against potential offenders.”
Warning signs include children appearing to be distressed or under the control of other people.
Peter Mair, operations manager for First in Sheffield, said: “Our staff live and work across our local communities and can play a valuable role in spotting signs of exploitation.”