Wordward,
I've been sitting here, bemused by all of these word pictures, for long enough; so now I'm going to add my own, which most likely will cloak somebody else(s) here with the mantle of invisibility, but that's of little import to me in my current state of mind (bemused, as you'll recall).

to wit, how does your example of two exit ramps differ (if at all) from the classic (at least around here it's classic) accelerating-to-merge-into-traffic-from-an-entrance-ramp-while-someone-else-is-speeding-by-you so that he (or she) can cut-in-front-of-you-and-brake-so-as-to-flow-into-the-exit-ramp-traffic, all with the two ramps in question being separated by 50 feet or less (or fewer)?

in my situation, this is called the classic-entrance-exit-two-ramp-poor-planning-bad-driver-conundrum.