drivers package:MASS R Documentation _D_e_a_t_h_s _o_f _C_a_r _D_r_i_v_e_r_s _i_n _G_r_e_a_t _B_r_i_t_a_i_n _1_9_6_9-_8_4 _D_e_s_c_r_i_p_t_i_o_n: A regular time series giving the monthly totals of car drivers in Great Britain killed or seriously injured Jan 1969 to Dec 1984. Compulsory wearing of seat belts was introduced on 31 Jan 1983 _U_s_a_g_e: drivers _S_o_u_r_c_e: Harvey, A.C. (1989) _Forecasting, Structural Time Series Models and the Kalman Filter._ Cambridge University Press, pp. 519-523. _R_e_f_e_r_e_n_c_e_s: Venables, W. N. and Ripley, B. D. (1999) _Modern Applied Statistics with S-PLUS._ Third Edition. Springer.