during fog Low beam or Parker's Or during heavy rain and full eclipses.
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Motor Vehicle law states that headlights MUST be used after sunset. IN some states they must be used all of the time, when it's raining or snowing or when conditions require it. If you have an accident because you choose not to use your headlights, your insurance company will probably not pay anything for it.
While it is mostly understood that any time visibility is reduced (fog, smoke, snow, rain, etc) you aught to use your headlights, this answer cannot be more specific unless you specify the locality you are driving in. Laws vary around the world and from jurisdiction to jurisdiction.
You must use your headlights between one-half hour before sunset to one-half hour before sunrise, or any other time when person or vehicles cannot be seen clearly for at least 1,000 feet.
equal opportunity rule
Headlights are required to be on from sunset to sunrise, and any time the visibility is less than 1000 feet.
you must use your headlights between one-half hour after sunset to one-half hour before sunrise, or anytime when person or vehicles cannot be seen
It will depend on state law. In general though, usually at sunset (before dusk and dark). Some people use them whenever its raining and their wipers are turned on. Some people use them all the time for safety...like me.In
In Illinois, yes. Other states may vary.Virginia Aswell
Potassium bi sulphate as food preservative under various conditions temperature concentration time
A statement that describes what scientists expect to happen every time under a particular set of conditions is a scientific law. A scientific law always applies under the same conditions, no matter what the elements are.
A statement that describes what scientists expect to happen every time under a particular set of conditions is known as scientific law.