In spite of the bad design, because the poll showed the results for which I'd posted it in the first place. Not a one of you associated "splay" with roadways. Neither did I, until last Sunday. We were driving down the M6, probably somewhere near Wigan, when my eyes caught a sign by the side of the road which read something like this: "Police Note: Irregular vehicles pull over in splay."
Not knowing what a splay was in this context, it was not immediately evident just where those vehicles should do their pulling over. Seconds later, right after an on-ramp, there was a jagged extra bit of paved surface inset into the bank by the side of the motorway. "Ah ha!", thought I. "A splay!"
I looked the word up, finally, when putting together yesterday's poll. Meaning d. in the OED was this: "A tapered widening of the carriageway at a road intersection or corner provided in order to increase visibility for motorists." In other words, technically, the splay was part of the on-ramp, not specifically the jagged extra bit of paved surface sticking out off of it.
I am reassured to know that none of you would have been absolutely certain what to do when confronted with that road sign either.