It doesn't really matter that CA vehicle code section 24407 states "There shall be an uppermost distribution of light, or composite beam, so aimed and of such intensity as to reveal persons and vehicles at a distance of at least 350 feet ahead for all conditions of loading", because:
• Federal Motor Vehicle Safety Standard 108, which governs the design and construction and performance of headlamps on all vehicles in the United States preempts state codes,
• All FMVSS 108-compliant headlamps, aimed correctly, provide at least 350 feet of seeing distance, and
• Homemade or home-modified headlamps are illegal both Federally and per CA vehicle code section 26101, so if you were thinking of trying your hand at making some headlamps, that puts the kibosh on that idea.
Section 24407 was written into law in 1963, before there were Federal standards.
100
According to the California Department of Motor Vehicles, the minimum following distance on highways is three car lengths. Anything closer is considered tailgatinging and is both unsafe and against the law. This distance is independent of time of day.
1000 ft
Headlights are required in periods of darkness and during a rain storm.
The Statues vary between states. But 450 ft is a generally accepted distance. The statutes do not get into more detail than to illuminate a person or object. It is much easier to recognize a person who is wearing white clothes against a dark background than a person in black. Therefore it is difficult to measure. Some states refer back to the FMVSS 108 lighting standard which gives acceptable Candela (luminence) values at specific locations in the beam when recorded at 18.3 meters away.
If it's raining enough for wipers on you have to have headlights on. Intermittent wiper its not required.
California and New York. Illinois I can add to this the states of Tennessee and Ohio although common sense tells me that it is probably required in the majority of states. Even if it's not required it is something that everyone should do. It's not so you can see better, it's so you can be seen more easily by others.
No. It is not required to register or operate the vessel in California. It is required by most Marinas if you want to get a slip.
Headlights are required to be turned on in Tennessee 30 minutes after sunset to 30 minutes before sunrise, when visibility it low, and in adverse weather conditions.
30 mins. before sundown
On Road: Yes. Modulating Headlights are OK to use during the day, also.Off Road: Required to ride after dark.
The required height of headlights, tail lights, and other auxiliary lights varies from state to state. StreetLegalLaws.com has a current list of lighting equipment laws for each state.