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

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        118        1.18        1.18
          2 |      6,625       66.25       67.43
          3 |        876        8.76       76.19
          4 |      1,641       16.41       92.60
          5 |        183        1.83       94.43
          6 |        351        3.51       97.94
          7 |         55        0.55       98.49
          9 |        151        1.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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