We show that a one-parameter unfolding F : (R-3 X R, 0) -> (R-3 x R, 0) of a finitely determined map germ f, with S(f) regular, is topologically trivial if it is excellent in the sense of Gaffney, and the family of the double point curves and cuspidal edges D(f(t)) boolean OR C(f(t)) is topologically trivial.