Final answer:
A solid white line is used to mark the right edge of a road, indicating that it is not safe to cross or change lanes.
Step-by-step explanation:
The type of line that is used to mark the right edge of a road is a solid white line.
In traffic safety, road markings are used to guide drivers and indicate rules of the road.
A solid white line on the right edge of a road signifies that it is not safe to cross or change lanes.
For example, if you see a solid white line on the right edge of the road, it means you should stay in your lane and not move into the shoulder or another lane.