Accord several links in my another thread
http://www.alldeaf.com/topic-debates/65671-list-countries-us-states-ban-cell-phone-use-while-driving.html
that the statistic of car accidents involvment is cell phone than alochol.
The accident has nothing do with hand, you hold the cell phone or headset while you driving but your mind because they occupy your mind.
There´re also no difference either your car have manual or automatic transmission but your mind is still multitask between talking and driving a car, no matter either hold cell phone with one hand or use headset....