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

      ROUTE |
    SIGNING |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,180       11.80       11.80
          2 |      1,497       14.97       26.77
          3 |      2,640       26.40       53.17
          4 |      1,749       17.49       70.66
          5 |         34        0.34       71.00
          6 |      2,784       27.84       98.84
          7 |         20        0.20       99.04
          8 |         72        0.72       99.76
          9 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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