Republican John F. Herrity, chairman of the Fairfax County Board of Supervisors, unveiled campaign ads yesterday that charge his Democratic opponent, Supervisor Audrey Moore, with voting against "every major new road project in the past 15 years in Fairfax County."

A spokeswoman for Moore's campaign, Janice Spector, said that the television and radio ads are based on "selected truths" that distort Moore's record and that Moore has at times supported several of the road projects the ads say she opposed.

The ads, a 60-second radio commerical and a 30-second television spot, began airing yesterday on a variety of media outlets, according to Tom Herrity, John Herrity's campaign manager and son. Tom Herrity said the campaign had bought about $40,000 worth of television time and $15,000 worth of radio time for the spots during the next two weeks.

Each commercial begins with a reference to Fairfax County's congested roads, a subject that has emerged as one of the campaign's foremost issues. Each then says that Moore has voted against two major roads that have already been built, the Dulles Toll Road and I-66, and one project that is planned, the Springfield bypass.

While the television commercial shows a picture of Moore, and each ad mentions her name frequently, Herrity's full name is not used. Each commercial briefly states that the ad is being paid for by Friends of Herrity, the campaign organization.

"The intention of this ad is to get Audrey Moore's transportation record out to the voters of Fairfax County, and it does that fairly and accurately," Tom Herrity said yesterday. Moore's campaign "is going to squeal, but it's a factual presentation of her voting record. And she's not admitting to her record on the subject."

Spector acknowledged that Moore had voted against all three of the projects on several occasions, but she said that the Annandale District supervisor had voted for each of the projects at various stages in their planning. "There's got to be the realization that road votes don't occur in a day," Spector said.

"These votes can occur over a period of years. And on balance, the record shows that she did not say 'no' to these roads."

Spector said that John Herrity's ads are evidence of desperation in his campaign. A recent Washington Post poll showed Herrity trailing Moore by about 12 percentage points.

Herrity's forces are "obviously headed down a negative path because they have nothing positive to say about their campaign," Spector said. "They are trying to take the focus away from Jack Herrity's development policies, which have given us uncontrolled, rampant development we did not have the road network to support."

Tom Herrity said that the ads were not prompted by John Herrity's showing in any poll and that Herrity's full name is not included in the ads because of time constraints. "I don't think this is something we're trying to keep Jack Herrity from being linked to," Tom Herrity said. "We had a plan in July that we would air these commercials now, and we have not changed from then until now."

The ads began airing on the same day as a series of transportation- related commercials sponsored by a nonprofit group called the Northern Virginia Transportation Alliance. The ads urge voters to evaluate the candidates on their records on transportation issues.

Moore has charged that the group is attempting to boost Herrity's campaign. A Republican consultant hired by the alliance, Edward DeBolt, denies the allegation.

"We are already planning an ad program for November and December {after the election}," DeBolt said. "We are never going to be partisan. I think what we're saying is even more important now that it looks like Mrs. Moore is going to win."