Plans for the second stage of the WIN Stadium western grandstand have been placed on exhibition until October 11, giving residents a final chance to have their say.

Stage two proposes seating for 3538 spectators, food and drink premises and the roof structure.

In total, the grandstand will provide seating for 5774 spectators, with the additional 3362 seats more than doubling the capacity of the old Sid Haye Stand. While that is down from the 6072 seats originally envisaged, it will still boost WIN Stadium's capacity to more than 22,500.

Parking and traffic have emerged as major issues, with just 19 additional parking spaces proposed. While 36 new spaces are planned west of the training ground, they will be offset by the loss of 17 spaces on Harbour St.

The Illawarra Venues Authority has prepared a rigorous traffic management plan after a survey of WIN Stadium and WIN Entertainment Centre users last year revealed 91 per cent of event attendees arrived by car.

Another survey at an NRL game in March this year found 73 per cent - or almost 10,000 spectators - arrived by car. That equated to almost 3200 cars.

A traffic impact study warned that if nothing was done, more than 12,000 spectators could be expected to travel by car to an event with 20,000 spectators.

Raising the cost of parking is among the options being considered to "send a clear message to patrons that premium parking comes at a cost".

More frequent rail services, Gong Shuttle services and Dragons rail shuttle services will be investigated, along with "park and ride" arrangements from JJ Kelly Park, the University of Wollongong and the Innovation Campus.

The stage-two development application was lodged on August 31, four days after the southern Joint Regional Planning Panel approved stage one of the grandstand. The proposal was split into two stages to avoid delaying construction after it emerged the roof would overhang a footpath and road reserve on Harbour St, breaching zoning rules.