(On a clear day, visibility is about 18.6 miles, or 30k.

What is a good visibility distance?

7=Visibility good, objects not visible at 10 miles (nautical). 8=Visibility very good, objects not visible at 30 miles (nautical). 9=Visibility excellent, objects visible more than 30 miles (nautical).

What is bad visibility?

What is poor visibility? Poor visibility is when road users cannot clearly see a distance of 100m ahead due to unfavourable conditions, such as low light, sun glare, rain, fog or dust. This often occurs on country roads, during a storm, on a glary day or at night-time.