When workers set cones manually from a moving cone truck platform, what Cal/OSHA safety fall-protection rule applies?

1. Workers may stand unrestrained on outer truck steps at speeds up to 45 mph safely.
2. Fall protection is exempt if the vehicle operates in forward gear.
3. Workers should sit on loose sandbags placed on the truck bed floor.
4. Workers must be protected by safety restraint harnesses or guardrail enclosures.