Frequencies for tway_flo variable in accident dataset :

 Trafficway |
       Flow |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        373       76.75       76.75
          2 |         50       10.29       87.04
          3 |         58       11.93       98.97
          4 |          5        1.03      100.00
------------+-----------------------------------
      Total |        486      100.00

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