  We consider a braneworld scenario in the simplest setting, $M_4 \times S^1$,
with a 4D Minkowski metric induced on the brane, and establish the possibility
of superluminal propagation. If the brane is at rest, the 4D Lorentz symmetry
of the brane is exact, but if the brane is in motion, it is broken globally by
the compactification. By measuring bulk fields, an observer on the brane sees a
slice through a higher-dimensional field profile, which carries an imprint of
the extra dimensions even when the brane is at rest. If the brane is in motion
we find that bulk fields can propagate outside the brane lightcone by a
parametrically large amount set by the brane velocity. We mention observational
tests and possible applications to cosmology.
