Blinkage

[Capt Jack]

for me its second nature. I signal in parking lots even if Im the only one there and even in the slow down lane at the drags. just force of habit. the truck I drive doesnt leave a lot of room for error, so you sort of have to be extra careful.

and yes, I use it constantly for "yo...mind if I take cuts?"
it results in either the person waving me in or slowing enough to let me know its cool or they speed past, hopefully making a gap large enough for me to jet into.

the "look out here I come" guys are the ones constantly getting hit and blaming someone else for not being a mind reader

IMHO