This is the sickening moment a moped rider knocks a teenage girl off her bike then flees the scene leaving her battered and bruised in the street.
The 17-year-old girl, who did not want to be named, was riding across a pedestrian crossing in Southey Green Road, Southey Green, when the moped smashed into her.
This dashcam footage from a car that was close behind shows how the rider gets back onto his machine then rides off along the pavement.
The victim needed hospital treatment for extensive cuts and bruises to her face, arms and legs and is now having to use crutches.
Her step-dad said the incident - which happened on Wednesday, June 20, at 4pm - is the latest example of how nuisance motorbike riders are out of control in the area.
The 45-year-old, who did not want to be identified, said: "She has been really upset and in a lot of pain.
"It makes me really angry to think that he would just ride off and leave someone injured in the street.
"But people on mopeds and off-road bikes is a major problem around here. Some of the streets have a 20mph limit because they are near a school but you see them tearing up and down at 40mph.
"The police need to get a handle on it before there is another big accident."
He also appealed directly for the moped rider to hand himself in.
He said: "He needs to face up to the consequences of his actions.
"I would urge him to come forward to the police."
Last year South Yorkshire Police trained a team of around 20 officers to patrol known hot spots for nuisance off-road bikers following numerous complaints from residents.
A force spokesperson said officers received "reports of a collision involving a pedestrian and a moped" and that "the driver left the scene."
They added officers are reviewing CCTV and dashcam footage.
Anyone with information should contact police on 101.