Council staff agreed to reconsider the idea, having previously decided it was unworkable, after a request from Cr Paul Hudson at this week's infrastructure services committee meeting.
However, council Rugby World Cup co-ordinator Debra Simes yesterday said staff had decided the option remained too problematic to work.
"It was not impossible, but with too high a risk to be practical," she said.
The idea would have provided up to 3000 car parks across the road from the stadium, considerably shortening the up to 1.7km fans were expected to walk to the venue.
However, the main problem remained the potential for damage to the ground in wet weather, or the risk of being forced to close the ground to vehicles on match days and use a last-minute alternative, Ms Simes said.
"The possibility of rain prior to match day, and the ability to manage the risk on match day if we had to change car-parking arrangements ... that was a big issue," she said.
There were organisational hurdles to overcome, as allowing vehicles to use Logan Park would "totally compromise" the traffic management plan - including 16 street closures - which will be in place around the stadium on match days, she said.
There was also an increased risk of ambush marketing if vehicles were allowed on to the ground, which was inside the 500m "clean zone" around the stadium, she said.
That was a threat the council and tournament organisers Rugby New Zealand 2011 Ltd wanted to avoid, to protect tournament sponsors, and using the ground would have required extra council staff and security to police, she said.
