Frequencies for no_lanes variable in accident dataset :

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        1.04        1.04
          2 |        249       64.84       65.89
          3 |         43       11.20       77.08
          4 |         58       15.10       92.19
          5 |          6        1.56       93.75
          6 |         24        6.25      100.00
------------+-----------------------------------
      Total |        384      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016