Texting bans can reduce teen traffic fatalities by as much as 11 percent, according to a new study of the effect of such state laws.
Texting bans can reduce teen traffic fatalities by as much as 11 percent, according to a new study of the effect of such state laws.
Not all texting bans are alike, of course. But ones aimed at teenagers and that allow primary enforcement of the law — for example, they don’t require officers to have another reason for the traffic stop — had the most dramatic effect, a team of researchers at the University of Alabama at Birmingham School of Public Health found in a study published in the August issue of the American Journal of Public Health.
“[O]ur results provide strong evidence that the primarily enforced texting laws seem to be reaching the intended subpopulations who are most at risk for texting while driving,” the researchers write.
The team examined 11 years of data from the 48 contiguous states for the study. They controlled for other factors that may influence crash risk, such as economic, legal and population-specific indicators. (Unemployment, for example, can influence risk because fewer workers means fewer drivers on the road. Income and gas prices can affect how much people drive, again exposing them to more risk.)
Just having a texting law was linked to a 2.3 percent decline in overall traffic fatalities for all drivers. But there’s a lot of variation in such bans.
From 2000 to 2010, 31 states passed texting-while-driving bans, 24 aimed at all drivers and seven aimed at young drivers. Delaware’s was first — its law went into effect in April 2005 — while Wisconsin’s was the most recent, taking effect in December 2010.
And some laws only allow enforcement of the ban if officers have another reason for the stop, which is known as secondary enforcement.
The first of the researchers’ three main findings was that primary enforcement really matters.
“Our results indicated that primary texting bans were significantly associated with a 3 percent reduction in traffic fatalities among all age groups, which equates to an average of 19 deaths prevented per year in states with such bans,” one of the authors, Alva O. Ferdinand, said in a statement.
The second main finding is that targeting primary bans at subpopulations seems to be effective. Such bans aimed at teens reduced deaths among that group by 11 percent. Finally, the researchers found that banning all handheld devices — without specifically making texting the target — were most effective at reducing traffic deaths among adults ages 22 to 64.
While 31 states passed texting bans during the 10 years studied, 44 ban texting among all drivers today, according to a late-June count by the National Conference of State Legislatures. Thirteen states ban handheld devices.