Cadillac 1993 DeVille Owners Literature page 215

Obey all posted speed limits. But remember that they are for ideal
road, weather and visibility conditions. You may need to drive below
the posted limit in bad weather or when visibility is especially poor.
Pull to the right (with care) and stop clear of intersections when you
see or hear emergency vehicles.
FREEWAYDWNG
Mile for mile, freeways (also called thruways, parkways, expressways,
turnpikes, or superhighways) are the safest of all roads. But they have
their own special rules.
The most important advice on freeway driving is: Keep up with traffic and
keep to the right. Drive
at the
same speed most of the other drivers are
driving. Too-fast or too-slow driving breaks a smooth traffic flow. Treat
the left lane on a freeway as a passing lane.
Entering the Freeway
At the entrance there is usually a ramp that leads to the freeway. If you
have a clear view of the freeway as you drive along the entrance ramp,
you should begin to check traffic. Try to determine where you expect to
blend with the flow. If traffic is light, you may have no problem. But if it is
heavy, find a gap as you move along the entering lane and time your
approach. Try to merge into the gap at close to the prevailing speed.
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