Jason Alexander lost his two daughters Tayla (left) and Sunmara (right) after a fiery crash on Christchurch's Port Hills. He wants the road to be improved.

A man who lost two teenage daughters to a fiery crash on Christchurch's Summit Rd wants the road to be made safer.

Ashburton teenagers Tayla Alexander, 17, and her sister Sunmara​ Alexander, 15, were in a car reportedly driven by a 19-year-old man, when it crashed in the Port Hills about 11pm on November 27.

Passersby, then emergency services, fought the fire and pulled the occupants out. Tayla died in the crash. Sunmara​​ was critically injured with extensive burns. Despite successive surgeries, she died on Friday, her 16th birthday, at Auckland's Middlemore Hospital.

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On Saturday evening, Jason Alexander said on social media he hoped action would be taken to change Summit Rd.

DEAN KOZANIC/STUFF A proposal to limit access to Summit Rd overnight was not supported by most of the public.

"Sunmara​ suffered so much, but hopefully not in vain. I would love to see that road sorted and more barriers up.

"I honestly don't know what's worse, being told your daughter has died in a car accident and that's that, or having to watch your daughter die in front of your eyes. I would honestly rather do the the first one ... As hard as it was I knew she didn't suffer."

Family friend Kelly Foster created a petition on change.org on behalf of Alexander, directed at the Christchurch City Council, the NZ Transport Agency and Parliament.

Foster wrote the road should be controlled during weekend evenings by a closed barrier system to prevent "needless racing or speeding around these hills."

SUPPLIED Sisters Tayla and Sunmara Alexander died after a fiery Christchurch crash on November 25.

She wanted to change rules and guidelines for young people getting licences, and make defensive driving courses compulsory.

Foster told Stuff the petition was "a legacy for two young lives gone too soon".

"I think sadly too many young are dying because of the naivety of racing and dangers incurred. I strongly believe that we need change – the Summit Rd is a dangerous racing zone."

TOM KITCHIN/STUFF The crash happened on a tight corner with barriers in place on Summit Rd, near Dyers Pass Rd towards Victoria Park.

The Christchurch City Council is responsible for managing most of Summit Rd, with a part near Gebbies Pass managed by the Selwyn District Council.

Christchurch city councillor Tim Scandrett has campaigned for changes on the road for several years.

Scandrett​ said he would like to revisit a failed proposal to prohibit vehicles weighing under 3500 kilograms from part of Summit Rd between Rapaki and Gebbies Pass Rds, from 10pm to 5am on Thursdays through to Monday mornings and on public holidays.

About 60 per cent of submitters to the council proposal were against the plan.

The speed limit had lowered in the area and there were double yellow lines on Dyers Pass Rd, but crash rates didn't seem to be improving, he said.

TOM KITCHIN/STUFF The scene of the crash on Summit Rd, where the car veered off road and down a bank near a barrier.

He acknowledged "restrictions on the budget" and said crashes often came down to "driver behaviour".

As of Sunday night, more than 1000 people had signed Foster's petition.

Jason Alexander said Sunmara's body was returned to the family on Sunday afternoon. After her extensive surgeries, he did not want an autopsy.

JOSEPH JOHNSON/STUFF The funeral ceremony for crash victim Tayla Bray Alexander was held at the Hampstead Rugby Club in Ashburton on December 5.

He wanted Sunmara's funeral to "make the town of Ashburton rumble".

"Any Harleys or V8 cars that would lead her hearse would be appreciated," he said.

A funeral date has not yet been set.