The article "Moose Make Wrong Move - Into Suburbs," Oct. 30, makes no mention of animal alert devices.High-frequency alert devices warn deer of approaching vehicles. We have them in our cars and have found them effective not only for deer but for dogs and fowl in the highways. We understand that the Missouri Highway Patrol cars are using them with success. Perhaps New England needs them, too. Margaret Purviance, Dawsonville, Ga. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.