Rose Crenca is entitled to give her own explanation of why she decided to reject her political past and become the leader of the pro-development majority on the Montgomery County Council. She is not entitled, however, to misrepresent her vote for massive new development in downtown Silver Spring as a "compromise" {Nov. 4}. There is not a hint of compromise in her vote for 11,250 new jobs.

Mrs. Crenca and her pro-development buddies, Bill Hanna, Mike Subin and Mike Gudis, gave the developers in Silver Spring everything they asked for. In fact, that is precisely how they arrived at the figure of 11,250 jobs. Developer Lloyd Moore told them he would settle for nothing less than 6,400 jobs, the Petrie project required 1,100, the National Oceanographic and Atmospheric Administration demanded 3,100, the CHK building asked for 500, and 150 were left for Mrs. Crenca's flexibility bank.

Totally ignored in all this horse-trading was the traffic analysis presented by the Silver Spring Traffic Coalition and the county council's own traffic expert. Oh, well, who cares about traffic and its effect on neighborhoods? On the Montgomery County Council only Bruce Adams, Ike Leggett and Neal Potter, who voted for a substantial but controlled level of growth that included a shopping mall and several new office buildings.

Clearly, Rose Crenca and Sidney Kramer and their pro-development allies are counting on the short memories of voters. But the traffic jams guaranteed by their action will be a daily incentive for the voters of Montgomery County to follow the lead of fed-up citizens in Fairfax County. We will not forget that Kramer, Crenca, Hanna, Subin and Gudis responded to the demands of a few developers but turned a deaf ear to most of their constituents.

WILLIAM H. LEARY Takoma Park

And now, introducing the new Rose Crenca -- the Montgomery County Council president whose swing vote on Nov. 3 resulted in approval of massive development for Silver Spring. You'd hardly recognize Mrs. Crenca. She votes differently, talks differently -- even governs differently. Only a week ago, she favored a 9,500 job development level. Then she voted in favor of a 11,250 job level, calling it a ''compromise''!

When I tried to call Mrs. Crenca's office the morning after the vote, no one was even there. I wonder if she's taking lessons from the folks over at 1600 Pennsylvania Ave.

MARILYN E. PARK Takoma Park