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

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         92        0.92        0.92
          2 |      7,035       70.35       71.27
          3 |        961        9.61       80.88
          4 |      1,336       13.36       94.24
          5 |        155        1.55       95.79
          6 |        253        2.53       98.32
          7 |         46        0.46       98.78
          9 |        122        1.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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