The Albion Park Rail bypass was a "major issue" in Gareth Ward's emphatic re-election.
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The Kiama MP has managed to increase his margin at each election with a estimated swing towards him of around 4 per cent this time.
This election was the first time Mr Ward had won every booth in the electorate, including those at Albion Park Rail and Mt Terry.
"There will be forever in this election campaign one thing I will remember and that is winning Albion Park Rail and Mt Terry," he said.
"I'm grateful to every single person who put their trust and faith in me."
Mr Ward believed people seeing construction work start on the Albion Park Rail bypass was a factor in that.
"It was a major issue in this campaign, for sure," Mr Ward said.
"For 16 years people told them that they will deliver the Albion Park Rail bypass or upgrades to the hospital but it didn't happen.
"I think a lot of people who voted for me probably voted Liberal for the first time."
Mr Ward said the strong win was a sign that people liked what the government was doing for the region.
"There's no doubt that when you work hard and get results, people reward that," he said.
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"You can't deny the roadworks that are happening right now, in addition to the things we've delivered. The commitments we've made can be seen across the region.
"That's why I think we've got the result that we have."
However, Mr Ward said he wasn't expecting a reward in the form of a ministerial portfolio for his continued strong showings in the Kiama electorate.
"The only reward I've ever wanted was to care and serve the people of Kiama," he said.
"I've got that. I'm a very happy man today."
With votes still being counted it was unclear on Sunday whether the Berejiklian government would have a clear majority to govern in its own right or would need to rely on the support of minor parties.
Mr Ward was confident it would be the former.
"I think it will be a majority government," he said.
"I think it will be tight but we'll have a majority."