It's illegal to text while driving in most U.S. states. Yet a study by researchers at the Highway Loss Data Institute (HLDI) that tracked four states’ claims activities before and after such laws were passed finds no reductions in crashes after laws take effect.
In fact, notes the research, such bans are associated with a slight increase in the frequency of insurance claims filed under collision coverage for damage to vehicles in crashes.
The findings are consistent with those of a previous HLDI study, which found that banning hand-held phone use while driving doesn't cut crashes. HLDI is an affiliate of the Insurance Institute for Highway Safety.
In the most recent study, HLDI researchers calculated rates of collision claims for vehicles up to 9 years old during the months immediately before and after driver texting was banned in California (January 2009), Louisiana (July 2008), Minnesota (August 2008), and Washington (January 2008). Comparable data were collected in nearby states where texting laws weren't substantially changed during the time span of the study. This controlled for possible changes in collision claim rates unrelated to the bans — changes in the number of miles driven due to the economy, seasonal changes in driving patterns, etc.
"Texting bans haven't reduced crashes at all. In a perverse twist, crashes increased in 3 of the 4 states we studied after bans were enacted. It's an indication that texting bans might even increase the risk of texting for drivers who continue to do so despite the laws," says Adrian Lund, president of both HLDI and the Insurance Institute for Highway Safety.
The District of Columbia was the first U.S. jurisdiction to ban all motorists from texting. This was in 2004, and since then 30 states have followed suit. Nearly half of these bans have been enacted in 2010.
HLDI's new findings about texting, together with the organization's previous finding that hand-held phone bans didn't reduce crashes, "call into question the way policymakers are trying to address the problem of distracted driving crashes," Lund adds.
Month-to-month fluctuations in the rates of collision claims in HLDI's four study states with texting bans for all drivers didn't change much from before to after the bans were enacted. Nor did the patterns differ much from those in nearby states that didn't ban texting for all drivers during the study period. To the extent that the crash patterns did change in the study states, they went up, not down, after the bans took effect. Increases varied from 1% more crashes in Washington to about 9% more in Minnesota (the result in Washington isn't statistically significant).
Young motorists are more likely than older people to text while driving. In all 4 of the study states, crashes increased among drivers younger than 25 after the all-driver bans took effect. In California, Louisiana, and Washington, the increases for young drivers were greater than for drivers 25 and older. The largest crash increase of all (12%) following enactment of a texting ban was among young drivers in California.
"The point of texting bans is to reduce crashes, and by this essential measure the laws are ineffective," Lund points out. He cautions that "finding no reduction in crashes, or even a small increase, doesn't mean it's safe to text and drive, though. There's a crash risk associated with doing this. It's just that bans aren't reducing this crash risk."
An Insurance Institute for Highway Safety study that relied on driver phone records found a 4-fold increase in the risk of injury crashes associated with phoning. A study in Canada found a 4-fold increase in the risk of crashes involving property damage. The crash risk associated with texting hasn't been quantified as precisely, but it may be comparable, if not greater, than the risk associated with phoning.
"Neither texting bans nor bans on hand-held phone use have reduced crash risk," Lund says.
Noncompliance is a likely reason texting bans aren't reducing crashes. Survey results indicate that many drivers, especially younger ones, shrug off these bans. Among 18-24 year-olds, the group most likely to text, 45% reported doing so anyway in states that bar all drivers from texting. This is just shy of the 48% of drivers who reported texting in states without bans. Many respondents who knew it was illegal to text said they didn't think police were strongly enforcing the bans.
"But this doesn't explain why crashes increased after texting bans," Lund points out. "If drivers were disregarding the bans, then the crash patterns should have remained steady. So clearly drivers did respond to the bans somehow, and what they might have been doing was moving their phones down and out of sight when they texted, in recognition that what they were doing was illegal. This could exacerbate the risk of texting by taking drivers' eyes further from the road and for a longer time."
Using a driving simulator, researchers at the University of Glasgow found a sharp decrease in crash likelihood when participants switched from head-down to head-up displays. This suggests that it might be more hazardous for a driver to text from a device that's hidden from view on the lap or vehicle seat.
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Corrected December 17, 2010 at 3:36PM: yes