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

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        141        1.41        1.41
          2 |      6,699       66.99       68.40
          3 |      1,173       11.73       80.13
          4 |      1,330       13.30       93.43
          5 |        279        2.79       96.22
          6 |        185        1.85       98.07
          7 |         25        0.25       98.32
          9 |        168        1.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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