Honda NSX-T 1998 Manual page 654

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Description
At a vehicle speed of 19 mph (30 km/h) or more, a signal from the vehicle speed sensor (VSS) activates the reverse lockout
solenoid, which causes the select lock pin to extend. As a result, the interlock cannot rotate to the reverse shift piece mak-
ing it impossible to select reverse gear.
At a vehicle speed of 16 mph (25 km/h) or less, the signal from the VSS is interrupted which turns off the reverse lockout
solenoid. The select lock return spring pulls the select lock pin back, enabling the interlock to move freely so that reverse
gear can be selected.