The editorial "Herrity-Moore -- and Results" {Sept. 26} was wide of the mark. In fact, it bordered on the irresponsible. I was surprised that a paper as influential as The Post could assess the situation in Fairfax County so inaccurately. As stated in a recent Peat Marwick Mitchell study, the county has built only 22 percent of the roads in the 1975 transportation plan. So much for Mr. Herrity's ability to move the bureaucracy.

The Post's statement that "for the most part, the growth is over" is absurd. As a longtime member of the McLean Planning Committee, I assure you there is no diminution in the building plans developers present to the committee monthly. The Fairfax County Board of Supervisors is out of tune with the times, with the needs and with public sentiment. What was growth will soon be devastation.

Under the policies of the present board, a few people have made large fortunes, at the sacrifice of county livability. A new slow-growth philosophy is vital to save what's left of the county. The only way to achieve that is to turn the rascals out, starting with Mr. Herrity. The average citizen knows this. Mrs. Moore is headed for a landslide. DON MORTON McLean

The Herrity-Moore race has one major issue: leadership. Who can lead Fairfax County to solutions of its transportation problems? How can it be Audrey Moore when she is a big part of the problem?

Young newspaper reporters may not know her record, but I've lived in Annandale for 17 years and I remember. In the '60s engineers and planners looked at the future traffic in the county and planned new highways, such as the Monticello Freeway and the Northern Virginia Parkway. In the '70s Mrs. Moore led the fight to kill those plans. She said the proposed roads were only rip-offs to benefit greedy developers, and that without the highways the developers would not build and the unwanted new people would not come. What leadership!

I wonder how many current Fairfax voters would now live in Prince William if she had been right? But even then, we would have to drive to work in or through Fairfax. When we citizens worked on the Annandale transportation plan in the mid-'70s, we were told the only answer was mass transit -- not roads -- and that the only way to get people onto buses and Metro was to let the highways get clogged. Are they clogged enough yet, Mrs. Moore?

Because she killed the earlier planned improvements, it will now take about 20 years and a billion dollars to straighten out our traffic mess. How much Moore can Fairfax County afford? Jack Herrity may not always travel at the right speed, but at least he leads us in the right direction. LOUIS L. GUY JR. Annandale