106                 WISCONSIN BLUE BOOK


  A typical dustless highway. D)uring 1939, 14,297,235 gallons of bitumi-
nous material were applied to 1,885 miles of the state's highways to
keep them free froml dust.


  Wisconsin is reducing its accident toll on its state trunk highways
by constructing grade separations at railroad crossings. Out of a total
of 880 such crossings 295 highway passes, either over ori under the
railroad, have been built.