US regulators seek to reduce road deaths with smartphone 'driving mode'

New voluntary guidelines for Apple, Samsung and others encourage system that blocks app and text use, but allows navigation and music

US regulators are seeking to reduce smartphone-related vehicle deaths with a new driving-safe mode that would block or modify apps to prevent them being a distraction while on the road.

The US National Highway Traffic Safety Administration (NHTSA) are to issue voluntary guidelines for smartphone makers, which will seek to restrict the apps and services accessible on a smartphone being used by a driver.