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

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        123        1.23        1.23
          2 |      6,757       67.57       68.80
          3 |        757        7.57       76.37
          4 |      1,656       16.56       92.93
          5 |        135        1.35       94.28
          6 |        354        3.54       97.82
          7 |         65        0.65       98.47
          9 |        153        1.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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