The TRL said that composing a text message behind the wheel took 63 seconds, in which time a car travels half a mile within town centre speed limits and over a mile within motorway speed limits.

• 交通实验室称,开车时编写一条短信需要63秒的时间,而车在63秒内可在市区行驶半英里,在高速公路上则可行驶一英里以上。