Thanks for refining my question into something relevant to the forum.
Yes, what I've seen appears to be an automatic pulsing of the both landing lights simultaneously. The lights flash with a regular rhythm and do so for as long as I can see them (usually until it's time for me to change lanes or otherwise get back to driving my car...). I was curious as to whether that signalled something out of the ordinary or was just a standard procedure on some aircraft....
Thanks again for the input!