The driver's father later arrived in a pickup truck, identified himself as NBI personnel and challenged the enforcer's authority before threatening him with a firearm.
An LTO investigation also revealed that the father's vehicle was equipped with unauthorized emergency blinkers.
The agency issued a show-cause order requiring the NBI employee to explain his conduct and submit relevant documentation.
He faces potential charges for improper operation of a motor vehicle and the illegal use of emergency blinkers, which carry penalties up to permanent license revocation.
The LTO has placed the employee's driver's license under a 90-day administrative suspension while formal proceedings continue.