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

Relation To |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,965       59.65       59.65
          2 |        201        2.01       61.66
          3 |        475        4.75       66.41
          4 |      2,662       26.62       93.03
          5 |        529        5.29       98.32
          6 |         66        0.66       98.98
          7 |         14        0.14       99.12
          8 |         37        0.37       99.49
         10 |          3        0.03       99.52
         11 |          5        0.05       99.57
         98 |          1        0.01       99.58
         99 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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