>Flashing headlights is also "i see you trying to merge in front of me and i'll give you space." I do this for the same reason - or more generalized - 'I see y

>Flashing headlights is also "i see you trying to merge in front of me and i'll give you space." I do this for the same reason - or more generalized - 'I see you are about to do _x_, and I acknowledge - go ahead'.