An optical signaling apparatus for use in highways or roadways (2),
particularly in low visibility conditions, wherein a roadway (2)
comprises at least one traffic bearing surface (S) with at least one
edgeline (3). The apparatus comprises light-emitting means (4) for
emitting at least one laser beam (5) and support means (6) designed to be
arranged along the roadway (2) for supporting the light-emitting means
(4). The apparatus also includes optical means (7) arranged along the
roadway (2) for interacting with the beam (5) in such a manner as to
selectively conform and project it either in a first direction (D.sub.1)
which is incident on at least one edgeline (3) to interact therewith, or
in a second direction (D.sub.2) substantially parallel to the traffic
bearing surface (S) to define a substantially continuous optical path
that can be viewed by the users, or even in both such directions
(D.sub.1, D.sub.2).