4. Robert worked as a bus driver for Greyhound. One night the bus he was driving rear ended a tractor trailer. Seven passengers on the bus were injured. The passengers filed negligence lawsuit against Greyhound, the passengers, as Plaintiffs, alleged Greyhound allowed Robert to drive the bus when they knew his vision was impaired. The Plaintiffs want Robert to undergo a vision test. Robert refuses. Can the court order Robert to have a vision test? Explain.