An organization that has been working in the Haredi community to raise awareness of road safety went to Rav Elyashiv to ask for a psak. The psak is being publicized as part of the project, in a publication being put out with a compilation of articles written by various people on the topics of road safety.

They asked Rav Elyashiv about a person who talks on his cellphone while driving. Rav Elyashiv supposedly said that such a person is a "rodef"  - someone who is seeking out to kill you. (source: Bechadrei and Mynet)

Normally the halacha in such a case, when a person is deemed to be a rodef, is that you could kill him before he kills you. Granting a driver the status of rodef for talking on his cellphone would mean, by the definition of the granted status, that if you saw a person driving while talking on his cellphone you would be able to shoot him in the head with a gun, for example.

When pressed for further explanation, Rav Elyashiv supposedly explained that the driver does not actually have a din of a rodef, but is very close to being a rodef. Can you "almost" kill him before he almost kills you? It seems the din of rodef is being given only for the sense of drama, so that the seriousness of the matter should be understood, but not for allowing anyone to actually shoot such a person in the head.