An 18-year-old man has told a Geelong court harrowing details about how his friend was struck and killed by a four-wheel drive near Winchelsea.

The accused driver, who faces a string of charges, allegedly didn't have his headlights on.

Tyler Dean and Oaklee Leamer were riding their motorbikes when Tyler was clipped in October last year.

Tyler Dean was struck and killed while riding with his best mate on a quiet country road near Winchelsea. (Facebook) (Facebook)

Oaklee turned around to find his best mate injured and dying on a quiet country street.

Jeynelle Dean-Hayes, Tyler’s mother, has told 9NEWS, “he was left in the dark, with nothing but a mobile phone light to try and get help [for Tyler]”.

“That shouldn’t happen to anyone.”

It was a harrowing experience for the then-17-year-old.

Oaklee Leamer was Tyler's best friend. The pair had been riding and smoking bongs on the night of the hit and run. (Facebook) (Facebook)

“He hugged me, and I sat there and I bawled my eyes out. I couldn’t really get much words out,” Mr Leamer told the court.

The teenager was the first witness to give evidence today and did so via video-link.

He admitted to the court that he did have a bag of marijuana on him at the time of the incident and that he and Tyler had already smoked some of it that day.

Oaklee Leamer told the court via video-link today "He hugged me, and I sat there and I bawled my eyes out." (Facebook) (Facebook)

Police will allege the driver, Billy Glynn, fled the scene of the crash.

In response to evidence from Oaklee that the 4WD didn’t have its headlights on, a mechanical investigator from Victoria police told the court that the alternator wasn’t operating.

Tyler’s family have started a petition in the wake of his death in an attempt to keep alleged hit and run drivers off the road.

Tyler's family have started a petition in the wake of his death to keep alleged hit and run drivers off the road. (Facebook) (Facebook)

So far the petition has more than 31,800 signatures.

Glynn is currently out on bail.