I'm not the developer for the A to JFK, but i was the one who put the updated signaling on the A to lefferts and updated stuff through out the line. It probably plays that Announcement between hoyt and nostrand because someone probably just copy pasted the route i updated from 207 to rockaway blvd, and then coded the rest to jfk.
On the signaling, there's currently no way for me to install it so they properly clear. If i make it so the first signal is a yellow - the following is a red, when the yellow turns green - the red turns yellow, the animation will clear at any speed and people will just ignore the timers. The other hold back is that i can't seem to make the timers trip people if they go through a timed red.
I will try and come up with a solution to this though.