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IIHS News | May 31, 2012Subscribe

States could sharply reduce teen crash deaths by strengthening graduated driver licensing laws

ARLINGTON, Va. — If every state adopted all five components of the toughest young driver laws in the nation, more than 500 lives could be saved and more than 9,500 collisions could be prevented each year. Some states could halve or more than halve their rate of fatal crashes among 15-17 year-olds if they adopted the strongest graduated driver licensing (GDL) provisions. These are the main findings of a new analysis by the Insurance Institute for Highway Safety and Highway Loss Data Institute (HLDI) meant to encourage states to improve GDL laws.

A new online calculator developed by the Institute and HLDI shows individual states the safety gains they could achieve by adopting some or all of the most beneficial GDL provisions in effect today. The five key components are permit age, practice driving hours, license age, and night driving and teen passenger restrictions.

The current best practices are a minimum intermediate license age of 17 (New Jersey), a minimum permit age of 16 (Connecticut, Delaware, District of Columbia, Kentucky, New Jersey, New York, Pennsylvania, Massachusetts and Rhode Island), at least 65 supervised practice hours (Pennsylvania) and, during the intermediate stage, a night driving restriction starting at 8 p.m. (Idaho and in South Carolina during daylight saving time) and a ban on all teen passengers (15 states and D.C.).

Prior Institute and HLDI research has shown that states with the strongest laws enjoy the biggest reductions in fatal crashes among 15-17-year-old drivers and the biggest reductions in collisions reported to insurers among 16-17-year-old drivers, compared with states with weak laws.

"Even the best states can do better," says Anne McCartt, Institute senior vice president for research. "There's room for improvement across the board, and states could see immediate reductions in fatal crashes and collision claims as soon as the beefed-up provisions are in force."

Graduated licensing enables new teen drivers to gradually build up driving experience as they mature and develop on-the-road skills. The system has three stages: a supervised learner's period, an intermediate license (after passing a road test) that limits driving in high-risk situations except under supervision, and a license with full privileges. Teens with learner permits should get lots of supervised driving practice, and once they have intermediate licenses they should be subject to limits on night driving and teen passengers. The longer the restrictions last the better.

In the mid-1990s, states began adopting elements of graduated licensing. By December 2000, all but nine states had GDL laws. Since there is no nationwide GDL system, the laws vary.

To recognize states with the best laws, the Institute began rating them in 2000 from good to poor. Initially, only six states and D.C. earned good ratings, and nine were poor. By May of 2011, 36 states and D.C. rated good, seven rated fair and seven were marginal. No states earned poor ratings. In recent years, legislators have been slow to toughen GDL laws, particularly when it comes to raising the age for a permit or license. During the 2010-12 legislative sessions, for example, nine states strengthened elements of their young driver laws, compared with 20 states during 2007-09 sessions.

The ratings initially encouraged states to adopt three-phase graduated licensing systems. The ratings, however, didn't show legislators how any state — even ones with already-strong laws — could boost the benefits of graduated licensing by targeting specific components, such as night driving restrictions, for improvement. The Institute now knows more about what works and what doesn't when it comes to keeping young drivers safe. Based on more than a decade of data, researchers are able to estimate the effects of changing individual provisions of GDL.

As a result, the Institute has decided to stop grading state GDL laws and switch to a calculator system designed to outline opportunities for improvement in every state. In addition to the best-practice scenario, the online calculator shows the estimated fatal crash and collision claim reductions that a given state can achieve with any combination of specific law changes. Users can easily navigate among states using a drop-down menu.

"States don't have to adopt the toughest laws in the nation to realize safety gains. Strengthening one or two components pays off. To maximize all of the benefits of graduated licensing, however, we would encourage lawmakers to consider the strongest provisions," McCartt says.

Stronger laws yield benefits

Iowa and South Dakota are examples of states that could sharply lower fatal crash and collision claim rates among teen drivers. Both states allow 14 year-olds to obtain learner permits. Iowa makes drivers wait until they're 16 to get a license, but South Dakota allows teens to get a license three months after their 14th birthday. The state has the youngest licensing age in the nation.

"That's too risky," McCartt says. "The younger teens are when they get their licenses, the higher their crash rate."

If South Dakota raised its license age to 17, the benefit would be an estimated 32 percent reduction in fatal crash rates among 15-17-year-old drivers and a 13 percent reduction in collision claims among 16-17-year-old drivers. Raising the license age to 15 1/2 could reduce fatal crashes by an estimated 16 percent and collision claims by 6 percent among teen drivers.

A crucial provision of any GDL system is a night driving restriction. South Dakota's starts at 10 p.m., but Iowa's doesn't begin until 12:30 a.m. Moving Iowa's restriction to 8 p.m. would reduce teens' fatal crashes 10 percent.

Neither state bars beginners from transporting other teens, a practice that increases crash risk. If both states adopted such a policy, they each could realize a 21 percent drop in fatal crashes among 15-17-year-old drivers and a 5 percent decline in collision claim rates among 16-17-year-old drivers. A one-teen-passenger limit would reduce teens' fatal crash rates 7 percent in either state.

If Iowa adopted the strongest provisions across the board, the state could see a 55 percent reduction in teens' fatal crash rates. South Dakota's estimated safety gains are even bigger — a 63 percent reduction in fatal crashes and a 37 percent drop in collision claims.

Even best states can improve

Connecticut's young driver law comes the closest to representing the current best-practices system. The state makes teens wait until age 16 for a permit and restricts all teen passengers during the intermediate stage of licensure. If Connecticut also adopted the best provisions for practice hours, license age and night driving, it could realize a 17 percent reduction in fatal crashes and a 13 percent reduction in collision claims among teen drivers.

New York is another state with a strong GDL program. It has a permit age of 16, a license age of 16 1/2, a night driving restriction beginning at 9 p.m., a one-teen-passenger limit and a 50-hour supervised-practice-driving requirement. Adopting the toughest provisions would reduce fatal crashes among 15-17-year-old drivers by 24 percent and collision claims among 16-17-year-old drivers by 7 percent.

"We encourage states to sharpen the core elements of their teen driver laws, particularly restrictions on night driving and young passengers," McCartt says. "Raising the licensing age would help in many states, but we realize that this isn't always a politically popular option."

About the calculator

The calculator grew out of the Institute and HLDI's 2009 evaluation of the effects of various provisions of teen licensing laws on fatal crashes and collision claims for teen drivers. In this analysis, fatal crashes are the rate of 15-17-year-old passenger vehicle drivers involved in fatal crashes per 100,000 teens. Collision claims are the frequency of collision claims per 100 insured vehicle years for 16-17-year-old drivers (an insured vehicle year is one vehicle insured for one year, two insured for six months each, etc.). Collision coverage insures against damage to the policyholder's vehicle. The findings indicate strong benefits of restricting when teens are allowed to drive and how many young passengers may ride along. Raising the license and permit age also reduces teens' fatal crashes. The calculator estimates reflect the relative importance of each provision and reductions states have seen as a result of GDL laws. Longer learner permit holding periods, a criterion under the prior rating system, don't show independent benefits in the new analysis.

Best GDL provisions by state as of May 2012
Permit age of 16:
District of Columbia
New Jersey
New York
Rhode Island
65 supervised practice hours:
Licensing age of 17:
New Jersey
8 p.m. night driving restriction:
Idaho (sunset to sunrise)
South Carolina (6 p.m. EST)
No teen passengers:
District of Columbia
West Virginia
Estimated percent reductions in teen driver collision claims and fatal crashes if states adopted best GDL provisions
Collision claims among drivers 16-17 years old Fatal crashes among drivers 15-17 years old
Alabama 26 44
Alaska 21 42
Arizona 25 41
Arkansas 28 50
California 13 25
Colorado 15 32
Connecticut 13 17
Delaware 8 26
District of Columbia 13 17
Florida 19 45
Georgia 18 32
Hawaii 13 37
Idaho 18 49
Illinois 15 41
Indiana 11 23
Iowa 29 55
Kansas 16 46
Kentucky 8 29
Louisiana 19 45
Maine 19 33
Maryland 9 19
Massachusetts 13 18
Michigan 14 42
Minnesota 20 43
Mississippi 29 47
Missouri 19 44
Montana 20 52
Nebraska 26 44
Nevada 12 23
New Hampshire 17 41
New Jersey 19 25
New Mexico 18 47
New York 7 24
North Carolina 10 38
North Dakota 24 56
Ohio 14 39
Oklahoma 12 36
Oregon 15 32
Pennsylvania 6 27
Rhode Island 11 31
South Carolina 20 45
South Dakota 37 63
Tennessee 15 41
Texas 22 44
Utah 18 32
Vermont 22 40
Virginia 14 37
Washington 16 34
West Virginia 25 31
Wisconsin 19 39
Wyoming 15 41

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