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

      lanes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        142        1.42        1.42
          2 |      6,620       66.20       67.62
          3 |      1,093       10.93       78.55
          4 |      1,414       14.14       92.69
          5 |        249        2.49       95.18
          6 |        205        2.05       97.23
          7 |         26        0.26       97.49
          9 |        251        2.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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