add onto this treacherous field the militant bicycle riders , the aggressive cruising tactics of throngs of gay men , ( which leave them less attentive to traffic patterns , or , if driving , to unattractive pedestrians , ) the drag queens and lipstick lesbians with their perilous heels , truckloads of diesel dykes , dog-walkers , stoned beggars weaving on and off of sidewalks and you have a recipe for disaster .