Featured Research

from universities, journals, and other organizations

Study: Higher Interstate Speed Limit Proves Safe For Indiana

Date:
June 23, 2008
Source:
Purdue University
Summary:
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.

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.


Story Source:

The above story is based on materials provided by Purdue University. The original article was written by Emil Venere. Note: Materials may be edited for content and length.


Cite This Page:

Purdue University. "Study: Higher Interstate Speed Limit Proves Safe For Indiana." ScienceDaily. ScienceDaily, 23 June 2008. <www.sciencedaily.com/releases/2008/06/080623175408.htm>.
Purdue University. (2008, June 23). Study: Higher Interstate Speed Limit Proves Safe For Indiana. ScienceDaily. Retrieved October 1, 2014 from www.sciencedaily.com/releases/2008/06/080623175408.htm
Purdue University. "Study: Higher Interstate Speed Limit Proves Safe For Indiana." ScienceDaily. www.sciencedaily.com/releases/2008/06/080623175408.htm (accessed October 1, 2014).

Share This



More Matter & Energy News

Wednesday, October 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

US Police Put Body Cameras to the Test

US Police Put Body Cameras to the Test

AFP (Oct. 1, 2014) Police body cameras are gradually being rolled out across the US, with interest surging after the fatal police shooting in August of an unarmed black teenager. Duration: 02:18 Video provided by AFP
Powered by NewsLook.com
Raw: Japan Celebrates 'bullet Train' Anniversary

Raw: Japan Celebrates 'bullet Train' Anniversary

AP (Oct. 1, 2014) A ceremony marking 50 years since Japan launched its Shinkansen bullet train was held on Wednesday in Tokyo. The latest model can travel from Tokyo to Osaka, a distance of 319 miles, in two hours and 25 minutes. (Oct. 1) Video provided by AP
Powered by NewsLook.com
Robotic Hair Restoration

Robotic Hair Restoration

Ivanhoe (Oct. 1, 2014) A new robotic procedure is changing the way we transplant hair. The ARTAS robot leaves no linear scarring and provides more natural results. Video provided by Ivanhoe
Powered by NewsLook.com
Argentina's Tax Evaders Detected, Hunted Down by Drones

Argentina's Tax Evaders Detected, Hunted Down by Drones

AFP (Sep. 30, 2014) Argentina doesn't only have Lionel Messi the footballer, it has now also acquired "Mesi" the drone system which monitors undeclared mansions, swimming pools and soy fields to curb tax evasion in the country. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins