For those that do not know..
. - Ditch Lights are mounted low and positioned to light up the dark places that the wheels would travel.
If looking out the side front window or through the front windshield, you would see the ground coming up to the wheels.
You can also have rear ditch lights for the times you need to back up in the dark.
A very helpful tool driving off paved roads at night.
- Fog Lights are made to shine light at a very low level in order for the light to light up the ground below the fog as much as possible and as far forward to cover the area in front your about to travel.
- Roof Mounted Lighting is used to light up either as far as you can see or as wide as an area you would like to light up.
Different lens on the lights make the light beam shine wide beam or a pencil like beam.
- Regular Driving lights have lens that allow you to see forward a reasonable distance and each left and right light shine a little to cover the sidewalk/shoulder area while still keeping the light low without blinding the cars approaching.
- High Beam lights are for lighting up the front area at a greater distance without concern of upcoming cars.
- Back-up lighting is used for when you back up and have a good coverage in a wide area.
- Used when backing up for example, at camp grounds.
- Hand operated lights that are sometime mounted on door pillars are used to sine light at a longer spot distance. Used to light up home address numbers for example.
Other members can add to what I missed or additional advice.
(The word editor rearranged the sentences after posting)