Frequencies for traf_flo variable in accident dataset :

 TRAFFICWAY |
       FLOW |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         40       10.42       10.42
          2 |        248       64.58       75.00
          3 |         91       23.70       98.70
          4 |          5        1.30      100.00
------------+-----------------------------------
      Total |        384      100.00

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