Yamaha BIG BEAR PROFESSIONAL 400 YFM400FPT Owner's Manual page 204

When riding in an area where you might not easily
be seen, such as desert terrain, mount a caution
flag on the ATV. DO NOT use the flag pole bracket
as a trailer hitch.
WARNING
_
Always mount a caution flag on the ATV to
make you more visible when operating in ar-
eas where you might not be seen by other off-
road vehicles. Watch carefully for other vehi-
cles.
_
Do not ride in areas posted "no trespassing". Do
not ride on private property without getting permis-
sion.
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