Frequencies for first 10,000 rows of no_lanes variable in accident dataset :

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        155        1.55        1.55
          2 |      6,832       68.32       69.87
          3 |      1,224       12.24       82.11
          4 |      1,192       11.92       94.03
          5 |        286        2.86       96.89
          6 |        169        1.69       98.58
          7 |         24        0.24       98.82
          9 |        118        1.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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