[FWDLK] '57's: History of dual vs. quadrilight headlights?

["Robert Whitman" <rwhitman@xxxxxxxx>]

Does anyone have the history of the transition to 4 headlights in 1957.
Which states had not yet legalized the 4 light system and why?  Did some
pass it through, halfway through the model year, so some cars sold in that
state are 2-light and some are 4-light?  Was it legal to buy a car from a
4-light state and register it in a 2-light state?  I bet one of you folks
out there knows all about it, I gotta know!!
-Robert in Kansas (a 2-light or 4-light state?)
-'60 Adventurer