If the tractor is in gear when started it will lunge forward or backward and could run over nearby workers before they can get out of the way. Trying to mount or dismount when the tractor is moving, especially when the deck or railing is wet. Slipping on the steps or platform when mounting or dismounting. Steps or shoes with grease or mud on them or that are wet can cause operators to slip and fall. Leaving the deck of the machine cluttered with tools and other items.
Loose tools can cause trips.
They can also become flying objects and strike workers nearby. Riding on the tongue or any part of the implement being towed. A bump or sudden jerk can cause the rider to lose balance and fall off. The operator not aware of where others are when the machine is started and put in motion. Leaving the parking brake off when parking the tractor especially on a slope.