Honda Civic Owner's Manual page 258

Carrying Cargo
Carrying Items in the Passenger
Compartment
Store or secure all items that could
be thrown around and hurt
someone during a crash.
Do not put any items on top of the
trunk panel. They can block your
view and be thrown around the
vehicle during a crash.
Be sure items placed on the floor
behind the front seats cannot roll
underneath and interfere with the
proper operation of the seats, the
sensors under the seats, or the
driver's ability to operate the
pedals.
Keep the glove box closed while
driving. If it is open, a passenger
could injure their knees during a
crash or sudden stop.
252
Carrying Cargo in the Trunk
Distribute cargo evenly on the
floor of the trunk, placing the
heaviest items on the bottom and
as far forward as possible.
If you fold down the back seat, tie
down items that could be thrown
about the vehicle during a crash or
sudden stop.
If you carry large items that
prevent you from closing the trunk
lid, exhaust gas can enter the
passenger area. To avoid the
possibility of
carbon monoxide
poisoning , follow the instructions
on page 51 .