Many involve children playing on the street, young pedestrians, cyclists, motorcyclists, novice drivers and passengers of public transport.

卷入许多事故的是在街上玩耍的儿童、年轻行人、骑自行车者、驾驶摩托车者、新驾驶员和公共交通乘客。

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Thirty states and the District of Columbia prohibit novice drivers and teenagers from using cell phones while driving, but no state has imposed such a ban on all drivers, Teigen said.

CNN: Call for car-phone ban likely to meet busy signal in states

Some 38 states ban text messaging for all drivers, while 31 prohibit all cell phone use by "novice drivers, " according to the Governor's Highway Safety Association.

CNN: STORY HIGHLIGHTS

In the past 10 years the NTSB has increasingly sought to limit the use of portable electronic devices -- recommending bans for novice drivers, school bus drivers and commercial truckers.

CNN: Call for car-phone ban likely to meet busy signal in states