Sunset is beautiful, but it is also a time of day when people are most likely to be outside. This means that they are at risk for different types of accidents and injuries.
The sun sets in the west and rises in the east, so it will set in the west at a certain time every day. When you see the sunset, you can look at your watch to see what time it will be when the sun sets again.
People often spend their evenings outside after work or after school, which means that they are more likely to be hit by a car or bicycle while walking home or riding their bike home from school.