- Eliminated (e.g. remove trees, put wires underground, shift poles)
- Minimised (e.g. use frangible/break- away poles, flatten slopes)
- Protected (e.g. crash barriers installed between road and hazard)
- Highlighted (e.g. paint with reflective paint, marked with reflective markers)
- free
- desired
- operating
- design
where desired = design
& operating = free