True, but I do see one every once in a while. I actually come from Roanoke, where turn signals and other good driving habits are commonplace.
Here's an idea: If an ambulance is running hot and they want to signal a left turn, how bout when they flip the turn signal on, the lights switch to a moderately flast scrolling pattern toward the left. (Opposite of course for right, and possibly center-out for 4-way flashers) but naturally, only when they've got the flashing lights turned on. Not the way most directional bars add a light to either direction and then when full, ALL turn off, I mean add a light to either side, and then when full, the "off" pattern scrolls the same way... this isn't working with words.
Pretend I've got a bunch of lights here, with . being "off" and O being "on".
A typical directional bar goes like this:
. . . . . .
. . . . . O
. . . . OO
. . . OOO
. . OOOO
. OOOOO
OOOOOO
. . . . . .
. . . . . O
. . . . OO
. . . OOO
. . OOOO
. OOOOO
OOOOOO
I mean more like this:
. . . . . .
. . . . . O
. . . . OO
. . . OOO
. . OOOO
. OOOOO
OOOOOO
OOOOO .
OOOO . .
OOO . . .
OO . . . .
O . . . . .
to signal a certain turn. (Anyone who could create a GIF animation taking up less space would be welcome to...)