True fog lights are short range. Real driving lights are longer range than your high beams. Either will require a seperate switch, wiring, relays, etc. You will come close to spending the cost of Euro lights, which have longer range and better patterns than the USDOT lights, and can be adjusted with the vacuum controls to fine tune their range. You will be amazed at how much light and distance vision you can get out of Euro lights without blinding oncoming traffic, and staying with a good stock wattage bulb like the Philips Vision Plus.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E