A flagger is struck by a dump truck in a work zone. That incident is best classified as which OSHA Focus Four hazard, and what control is most directly required?

1. Caught-in/between only; no traffic control is required
2. Struck-by; use MUTCD Part 6 traffic control, high-visibility garments, and keep workers out of equipment swing and travel paths
3. Electrocution; de-energize the truck battery
4. A fall from height; install a guardrail on the truck bed