Drive-over is a real rating
In-grade fixtures are made in very different strengths. Some will take a foot. Some will
take a lawn tractor. A smaller number are built and rated to be driven over by a car,
and fewer still by a delivery truck. Putting the wrong one in a drive gives a cracked
lens the first week. When a fixture must sit in the paving, the rating is the first
thing settled.
Water and sand
A fixture set flush in pavers is in the lowest place on the surface. In a summer
downpour it is under water, and afterward it is where the sand and the leaf litter
collect. The lens films over and the light dims. Pavers here sit on a sandy base that
moves a little over the years, so a fixture that was flush can end up proud of the
surface or sunk below it.
The safest place for a driveway fixture is somewhere a tire will never be.
Keeping out of the tire path
Most of the time there is no need for a light in the driving surface at all. The same
edge can be drawn from the planting beside it, from the foot of a wall, or from the
trees. Where the drive is wide open paving with nothing beside it, a few correctly
rated in-grade markers at the margin, outside the wheel tracks, do the job.
Cable that has to cross under a drive is the other thing to plan early. If the drive is
being laid or relaid, a sleeve put under it now saves cutting it later.