The 22-year-old victim was injured after stopping her car on New Road, near the Oval in Holmfirth, when she saw a blue bike in the road at 11.45pm yesterday.
Her 21-year-old friend, who had also been driving home from a night out in a separate car, left her vehicle to move the bike and was shouted at by a man at the bus shelter who came towards her holding a bottle.
The man continued to shout at her to leave the bike alone, but walked up to the second car and used the bottle to smash the driver’s side passenger window.
This resulted in the 22-year-old woman inside receiving serious facial injuries from the flying glass. Both women drove away to safety and called emergency services, say police.
The 22-year-old was taken by ambulance to Leeds General Infirmary where she was being treated today for serious but not life threatening head and neck injuries.
Kirklees CID were appealing for witnesses and conducting widespread enquiries in the area today.
Detective Inspector Stef Wiseman of Kirklees CID, said: “Widespread enquiries are ongoing into this assault which has left the victim with serious injuries.
“This was an apparently motiveless attack which could have had potentially fatal consequences and we are keen to arrest the man responsible as quickly as possible.
“He is believed to be local to the Holmfirth area and is described as white, in his late 20s or early 30s, 5ft 7ins to 5ft 8ins tall and of scrawny build. The man has brown hair and was riding a mountain bike with a blue light on the front and a red one on the back.
“We believe he has previously hung around the skate park in Holmfirth and may well be known locally.”
She added that the incident was “extremely unusual” for Holmfirth and appealed for anyone with information to contact Kirklees CID on 101 or independent crime-fighting charity Crimestoppers anonymously on 0800 555 111.