I have read here of Virgil's recommendation of aiming auxiliary driving lights (or dedicated high beams) in a slight cross-eyed fashion. If you were to follow this approach, what distance would you choose for the two beams to converge?
I'd maybe cross them at maybe 450 feet, which depending on how close together your auxiliary high beams are, is a very very slight angle to aim them in from straight ahead, about 2/10ths of a degree inward if they were spaced 3.5' apart from each other. (Simple trigonometry.)
It really depends on how far you really expect to be looking downrange-- 450ft about 4 seconds at 70mph. But auxiliary high beams aren't an excuse to speed up (or to
speed!), rather they make slightly safer to attempt to use daytime speeds at night.