Raised Reflective Pavement Markers (RRPMs) can reduce the likelihood of night-time casualty crashes by up to 21% (Sun and Das 2013).
The Victorian colour configuration is:
????Red: left edge line; right side of large splitter islands (diverging traffic)
⬜White: along or beside lane lines
????Yellow: along or beside dividing lines; right edge line on divided road; left side of large splitter islands; median island outline
????Green: left shoulder on the approach (160m) to an exit nose (and at informal truck parking areas)
????Blue: Location of water access points (for emergency services)
See AS1742.2 Clause 5.6 and jurisdiction supplements for more info.