I think the correct answer is 500 feet, however keep in mind that rain and other humidity in the air does crazy things on mirrors and windshields.
Yes!
some vehicles have DRL ( daytime running lights ) make sure your insurance company knows you have them itll lower your rate a few bucks
Mine has been the actuators for the headlights that needs replacing.
shift to a lower gear
Yes. When your high beams run the risk of blinding oncoming traffic you must dim them. The exact distance will vary with how powerful your beams are, and the alignment of the cars. If you're on the outside face of a curve you can keep them on a little longer. In Texas, per 9-1 of the Texas Drivers Handbook, you should lower (dim) your headlights when you are: 1) Within 500 feet of an approaching vehicle. 3) When driving on lighted roads. 4) When driving in fog, heavy rain, sleet, snow, or dust.
You will need to remove the front bumper to access the lower bolts which hold the headlights on. fairly simple job.
You probably have something like a work truck model, or one of the lower end models (such as the Cheyenne), rather than the Silverado. The single square headlight was still an option (and a less expensive one), and is commonly seen on fleet vehicles, service trucks, US government vehicles, etc.
Fog lamps can either be upper or lower, but in order to be street legal, they must be lower than the headlights.
If your looking down at your headlights there will be a a screw on the bottom left of the headlight. It should be a 4mm. Counter clockwise will lower them and clockwise with raise them
Park your vehicle approximately 15 feet from your garage door or another wall. Open the hood and on top of both of the headlights you will see adjustment screws. Rotating them will lower/raise the headlights
The are adjustment screws next to the headlight housings. To adjust the headlights either loosen or tight the screws. This will either raise or lower the headlight unit.
Both.