Ford Probe Owner's Manual page 152

Reverse
In the Reverse (R) position, the vehicle moves
only backward. Your vehicle must be stopped
before shifting into Reverse (R).
Neutral
In Neutral (N), the wheels of the transaxle are
not locked. Your vehicle will roll freely, even on
the slightest incline, unless the parking brake or
brakes are on.
Parking
Always come to a complete stop before you shift
into P (Park). Make sure that the shift selector
lever is securely latched in P (Park). This locks
the transaxle and prevents the front wheels from
rotating.
Always set the parking brake fully and
make sure that the gearshift is securely
latched in P (Park).
Never leave your vehicle unattended
while it is running.
You can tell the gearshift is securely latched
when the thumb button has popped out. In this
position the gearshift selector lever cannot be
moved unless the button is pushed in.
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