Audrey Moore, Fairfax County Board of Supervisors chairman-elect, told business leaders yesterday that the county's transportation problems are "worse than even I anticipated" and will cost billions of dollars and take years to solve.

Democrat Moore, who has long advocated slowing the county's growth and made that issue the keystone of her successful election campaign, said she will pursue "more balanced development policies" while in office, adding, "I am not going to change what I believe over the next four years. But I also am not going to lead a no-growth board."

"Those of us concerned with both transportation and land use have to face the political reality that the voters have looked at our traffic problems and voted overwhelmingly for more balanced development policies," said Moore, who will take office Jan. 1.

Though short on specifics, Moore's 15-minute address to about 300 business leaders and developers seemed designed to:

Reduce developer fears about what land use policies Moore will seek while in office.

Lower expectations about how quickly the county's traffic problems can be solved.

Drive home the high cost of remedies and stress that much of the money will have to come from local, not state, sources.

Repair relations with members of the business and development community, many of whom supported Republican Chairman John F. Herrity in the election.

Moore was interrupted by applause once, when she told the group, "Between now and 1991, there will be no bureaucratic delays on site plan reviews as a way of doing through the back door what you can't do through the front door." She received a standing ovation at the beginning and end of her speech, which was sponsored by the Democratic Business Forum at the McLean Hilton Hotel.

Henry A. Long, a prominent local developer who a week before the Nov. 3 election said Moore "can't change stripes overnight," said, in essence, she had. "I couldn't have written a better speech for her," Long said after the address. "She spoke as encouragingly and positively as she could. She said we have to buckle down and work together, and that's the truth."

Asked for his opinion about Moore's comments on land use issues, Long said, "I could be apprehensive about that, but I'd rather not anticipate what she meant. I'd rather focus on her comments about working fairly as the basis for her actions, and as long as that's the case, we {developers} won't have a problem."

One developer, who spoke only on the condition he not be named, said he and others had hoped for more specific proposals from Moore about how to combat the area's transportation crisis.

Moore, after her speech, said, "I don't have the answers. I know where possible sources of revenue are {for financing road improvements}; there aren't that many. But we need a whole lot of people working together to wrestle with these problems. Maybe I'll talk about how we're going to do that later on."

In her address, Moore said, "We could spend $4 billion and not have all our traffic problems solved . . . . Where do we get that money?" It's not coming from the state . . . . The needed money is going to have to come from our own pockets."

Moore called for "a new road bond {referendum} that would be as large as possible, as soon as possible." She said the county has more than $135 million in authorized but unsold bonds -- a figure county officials said was $13 million too high -- and that "one of the first orders of business for the new board is to put this $135 million to work on the Springfield bypass."

"We are going to have to work closely with the state Department of Transportation to fast-track the bypass design and right-of-way processes," she said. "Based on my discussions with Gov. {Gerald L.} Baliles and Transportation Secretary Vivian Watts, I'm confident that we can work out new procedures {for} cutting through some of the red tape."

Moore said the new board "will have to tackle the difficult problem of revising our master land use plans to take into account a comprehensive transportation solution," but warned that major results probably won't be seen by 1991, the next time the board is up for reelection.