Study: Higher interstate speed limit proves safe for Indiana

Jun 23, 2008

Researchers at Purdue University have determined that raising the speed limit from 65 to 70 on Interstate 65 in Indiana has not increased the probability of fatalities or severe injuries.

"These findings are important because the influence of speed limits on roadway safety has been a subject of continuous debate in the state of Indiana and nationwide," said Fred Mannering, a professor of civil engineering. "Indiana highway-related accidents result in about 900 fatalities and 40,000 injuries annually and place an incredible social and economic burden on the state."

The findings add new fuel to an ongoing debate, with some studies indicating that the benefits of raising the speed limit outweigh potential safety hazards while others suggest just the opposite.

"The safety of raising the speed limit has been a matter of considerable concern in Indiana since the state raised its speed limits on rural interstates and selected multilane highways on July 1, 2005," Mannering said. "Everybody expects that when you increase the speed limit, injuries and the severity of injuries are going to increase, but that hasn't happened on the interstate highway system in Indiana."

Findings are detailed in a research paper presented earlier this year at a meeting of the Transportation Research Board of the National Academies of science and engineering. The paper, appearing in an upcoming issue of the Transportation Research Record, was written by Mannering and research assistant Nataliya V. Malyshkina.

The researchers used a series of mathematical equations in "multinomial logit models" to calculate accident probabilities based on motor vehicle accident data from 2004 and 2006, before and after the speed limit increased. The models showed that the increased speed limit did not affect the probability of suffering a severe injury in an accident.

Understanding the magnitude of the safety impact of increasing speed limits, or whether safety is improved or compromised, remains a contentious subject, Mannering said.

That's because research has not been able to convincingly unravel the effects of speed limit changes from factors such as speed enforcement; vehicle miles traveled; vehicle occupancy; seat belt usage; alcohol use; proportions of passenger cars, minivans, pickup trucks and sport utility vehicles; and vehicle safety features, including air bags and antilock brakes.

The models used in the research calculate "estimated probabilities" based on accident data. Of the 204,382 accidents on state highways in 2004, 21 percent resulted in injuries and about 0.4 percent were fatal. The same percentages were seen in the 182,922 accidents in 2006. Comparing only highways where the speed limit rose to 70 showed virtually no change from 2004 to 2006.

The speed-limit increase made Indiana the 30th state to raise interstate speed limits up to 70 mph on rural interstates.

Findings by other researchers suggest even higher speed limits on interstate highways might also result in no rise in the probability of severe injuries.

"If going from 65 to 70 doesn't have a significant effect on the severity of accidents, you have to ask yourself, what about 70 to 75?" Mannering said. "At what point does it begin to impact safety?"

The change has highlighted the tradeoff between speed and safety, a debate that began more than three decades ago since passage of the Emergency Highway Energy Conservation Act in 1974, which mandated a 55 mph national maximum speed limit on interstate highways in the United States, Mannering said.

State and federal speed-limit policy changes have been driven by various research findings and subsequent legislation, including the National Highway System Designation Act of 1995, which gave states freedom to set interstate speed limits.

Most research efforts have concluded that the 1974-mandated 55 mph interstate speed limit saved lives, a conclusion that has been confirmed by some studies looking at recent speed limit increases on interstates.

"For example, one study found that a speed limit increase from 55 to 65 resulted in roughly a 3 percent increase in the accident rate and a 24 percent increase in the probability of a fatality once an accident occurred," Mannering said. "But then other studies have contended that legislation-enabled speed-limit increases have actually saved lives. One study argued that increasing from 55 to 65 saved lives because of shifts in law enforcement resources, the ability of higher speed limit interstates to attract riskier drivers away from inherently more dangerous non-interstate highways and reducing how often drivers speed up and slow down."

The state also increased the speed limit from 55 to 60 on non-interstate multilane roads, but findings were inconclusive regarding the impact on those roadways, Mannering said.

However, the researchers cautioned that future speed limit increases should be carefully assessed for those roads on a case-by-case basis. The potential for accidents is higher on such roadways because of factors including stop-and-go traffic and vehicles entering the road from various businesses and residential areas.

Source: Purdue University

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User comments : 4

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dbren
4 / 5 (4) Jun 23, 2008
"Everybody expects that when you increase the speed limit, injuries and the severity of injuries are going to increase..." but "everybody" has absolutely no reason to believe that except that they hear it over and over by government officials and insurance company alarmists who use such assertions to justify their predatory revenue schemes. Everybody does in fact know what a fiasco the US's "55 saves lives" campaign was. It was a typical example of what happens when self-serving government bureaucrats team with an industry (insurance) with a dubious history of customer service, to bilk taxpayers out of their money through the synergistic effects of speeding tickets and increased insurance premiums.
Jack5551212
3.7 / 5 (3) Jun 24, 2008
"Everybody expects that when you increase the speed limit, injuries and the severity of injuries are going to increase..." but "everybody" has absolutely no reason to believe that except that they hear it over and over by government officials and insurance company alarmists who use such assertions to justify their predatory revenue schemes. Everybody does in fact know what a fiasco the US's "55 saves lives" campaign was. It was a typical example of what happens when self-serving government bureaucrats team with an industry (insurance) with a dubious history of customer service, to bilk taxpayers out of their money through the synergistic effects of speeding tickets and increased insurance premiums.


Well said!
SDMike
2.5 / 5 (2) Jun 25, 2008
Please don't tell the Democrats.
DoctorKnowledge
not rated yet Jun 28, 2008
Why would tickets be any more or less likely with a different speed limit? Apart from fuel cost considerations, I drive at 5 mph above whatever the speed limit is to avoid getting tickets -- as do many other drivers.

This article is not saying 55 mph is as safe as 70. It's saying that given many factors 65 is as safe as 70. If you are in a car that hits a phone pole dead on at 70 or 65, for example, you're dead. For that kind of accident, for example, the speed doesn't make a difference, you're dead.

Also note that cars are far safer than they were in 1974: 34 years ago! There was nothing on the road that could match a good car today with airbags and computer-designed crumple structures. The difference between 55 and 70, 35 years ago was much more significant.

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