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

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        147        1.47        1.47
          2 |      6,984       69.84       71.31
          3 |        761        7.61       78.92
          4 |      1,593       15.93       94.85
          5 |        155        1.55       96.40
          6 |        288        2.88       99.28
          7 |         23        0.23       99.51
          9 |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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