Christchurch's riskiest intersections have been revealed, but the budget to improve trouble spots around the city is "highly constrained".

The Christchurch City Council released a list of the city's 100 most dangerous intersections after Mayor Lianne Dalziel this week said there were 93 junctions worse than the "extremely dangerous" intersection of Harewood, Breens and Gardiners roads.

Potential changes to the Bishopdale crossroad were hotly debated, before councillor Aaron Keown failed to gain enough support to have $800,000 included in the draft annual plan to upgrade it.

ALDEN WILLIAMS/FAIRFAX NZ Number 2: Ilam Rd, Middleton Rd and Riccarton Rd intersection.

The council's list, created in January, shows the giant roundabout at Russley Rd and Memorial Ave – the site of 56 crashes between 2012 and 2015 – is ranked the city's most high risk intersection.

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It is undergoing a major $112 million road improvement, which is due to be completed in 2018.

ALDEN WILLIAMS/FAIRFAX NZ Number 3: Main South Rd, Blenheim Rd and Epsom Rd roundabout.

Have you had a bad experience at these intersections? Email nick.truebridge@fairfaxmedia.co.nz

Other intersections rounding out the top 10 accounted for 100 crashes between 2011 and 2015.

The crashes resulted in 121 injuries, 12 of which left the driver or a passenger in a serious condition.

DAVID WALKER/FAIRFAX NZ Number 4: Marshlands Rd and QEII Drive.

Crash rates were influenced by factors other than engineering design, such as driver behaviour like red light running.

A council spokeswoman said each of the 100 intersections was ranked according to the level of risk at each location.

Within "a highly constrained budget", the council's intersection programme focussed on the highest risk locations combined with other network needs, such as improving capacity.

ALDEN WILLIAMS/FAIRFAX NZ Number 5: Clyde Rd, Creyke Rd and Kotare St intersection.

The order of ranking changed over time due to events at individual intersections.

Canterbury road policing operations manager Senior Sergeant Kelly Larsen said drivers either chose to stop for the orange light or continue through, at every traffic light controlled intersection.

"Police encourage drivers to ensure they are 100 per cent focused on the road ahead of them, stop at stop signs and for orange lights.

DAVID WALKER/FAIRFAX NZ Number 6: Sawyers Arms Rd and Gardiners Rd.

"We're all really busy, with lots of demands on our time, however police urge drivers to take an extra minute or two to ensure they get to their destination safely," she said.

Speed and whether people were wearing their seatbelt were keys factors in determining the severity of a crash.

Wearing a seatbelt increased a person's chance of survival by 50 per cent, Larsen said.

DAVID WALKER/FAIRFAX NZ Number 7: Styx Mill Rd and Cavendish Rd.

KEOWN RESOLUTE IN STANCE

Harewood ward councillor Aaron Keown campaigned on the promise of traffic lights to make the intersection of Harewood, Breens and Gardiners roads safer.

But the council list shows – despite the medium to high risk of a fatal or serious crash occurring at the location – that 93 sites had an even higher risk.

ALDEN WILLIAMS/FAIRFAX NZ Number 8: The Gasson St, Madras St and Moorhouse Ave intersection.

After seeing the top 100, which had the Bishopdale intersection at 94, Keown stood by his proposal to spend $800,000 installing traffic lights and improving the intersection.

"When that information was used, that there was 93 intersections more dangerous, you're talking in [the] context of the discussions around that intersection getting upgrades and funding.

"Most of the 93 have traffic lights, they're more dangerous, but they're not in line for funding," Keown said.

ALDEN WILLIAMS/FAIRFAX NZ Number 9: Bealey Ave and Madras St intersection.

The public in his ward wanted traffic lights at the intersection and Keown had nearly 1700 signatures to prove it.

"The people of Harewood who voted for me knew I was running on lights," he said.

"Is it really the traffic experts, that do their modelling based on what accidents have happened, [who] are the ones that make the decisions?

DAVID WALKER/FAIRFAX NZ Number 10: Main North Rd and Northcote Rd.

"What about the thousands of people that drive through it?"

Waimairi ward councillor Raf Manji supported Keown's stance this week.

"This has been the process of democracy and the community has already been consulted and spoken in very high volumes."