  We analyze physical spacings between locations of safety rest areas on
interstates in the United States. We show normalized safety rest area spacings
on major interstates exhibit Wigner surmise statistics, which align with the
eigenvalue spacings for the Gaussian Unitary Ensemble from random matrix theory
as well as the one-dimensional gas interactions via the Coulomb potential. We
identify economic and geographic regional traits at the state level that
exhibit Poissonian statistics, which become more pronounced with increased
geographical obstacles in interstate travel. Other regional filters (e.g.,
historical or political) produced results that did not diverge substantially
from the overall Wigner surmise model.
