Robert James Markham, high on cannabis and driving erratically on the wrong side of the road, collided head-on with the Hills’ motorcycle, throwing the riders from the bike.

Despite efforts to treat him, Mr Hill died at the scene.

In an emotional statement delivered during sentencing proceedings for Markham yesterday, Mrs Hill recalled the heartbreaking moment she discovered her husband had died.

‘‘It was the worst moment of my life ... this event has taken two lives - my husband is never coming home and my life as I knew it has gone forever,’’ she told Wollongong District Court.

‘‘Whenever I have to drive up that mountain or pass a roadside memorial, it brings it all back - I feel a tightening in my throat and stinging in my eyes but it doesn’t compare to the devastation I feel knowing I will have to spend the rest of my life without my husband.’’

Markham, 33, was travelling south along Moss Vale Rd near Barrengarry Mountain about 3pm on November 20, 2010, opting to get behind the wheel, drug-affected and toting two passengers, facts before the court said.

Hitting a line of slower-moving traffic, Markham veered onto the wrong side of the road to overtake the cars and later to avoid a learner driver.

He then continued on the wrong side of the road, overtaking another car before he merged back into the southbound lane.

As he later negotiated a sweeping bend, he again veered onto the incorrect side of the road, planning to overtake another car just as the Hills’ bike came around the corner.

He started to brake but his car hit the front of the bike, throwing the riders forward onto the windscreen.

Markham, who pleaded guilty to aggravated dangerous driving occasioning death and aggravated dangerous driving occasioning grievous bodily harm, told the court he sometimes wished he had died in the accident.

The Bowral father of four admitted to being a chronic cannabis user at the time of the crash but denied feeling under the influence, despite a doctor’s determination that Markham’s driving would have been ‘‘substantially impaired’’.

Crown solicitor Michael Stollery argued Markham’s level of moral culpability was high, given the significant injuries suffered by Mrs Hill, his cannabis consumption and the fact he risked the lives of other drivers.

Defence barrister David Price said his client was genuinely remorseful for the offence and had participated in a detox program, significantly reducing his cannabis use.

Mr Price said Markham had no criminal history and was suffering post-traumatic stress.

Judge Paul Conlon adjourned the matter to next Thursday for his sentencing judgment.