Frequencies for road_flo variable in accident dataset :

    Roadway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         69       14.11       14.11
          2 |         14        2.86       16.97
          3 |         32        6.54       23.52
          4 |        366       74.85       98.36
          5 |          8        1.64      100.00
------------+-----------------------------------
      Total |        489      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016