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Legislation and Licensing

Countermeasure

Effectiveness

Cost

Use

Time

Lower Speed Limits

5 Stars

$

High

Varies

Variable Speed Limits

2 Stars

$$$

Medium

Varies

Increasing Penalties

4 Stars

Varies

High

Varies

Enforcement

Countermeasure

Effectiveness

Cost

Use

Time

Speed Safety Camera Enforcement

5 Stars

Varies

Low

Medium

High-Visibility Enforcement

4 Stars

$$$

Medium

Medium

Other Strategies for Behavior Change

Countermeasure

Effectiveness

Cost

Use

Time

Dynamic Speed Display/Feedback Signs

5 Stars

$

High

Short

Intelligent Speed Assistance

3 Stars

Varies

Unknown

Varies

Approaches That Are Unproven or Need Further Evaluation

Countermeasure

Aggressive Driving and Other Laws

Diversion and Plea Agreements/Traffic Violator School

 

 

Evaluation Metrics

Effectiveness:

 

5 Stars

Demonstrated to be effective by several high-quality evaluations with consistent results.

4 Stars

Demonstrated to be effective in certain situations.

3 Stars

Likely to be effective based on balance of evidence from high-quality evaluations.

2 Stars

Limited evaluation evidence, but adheres to principles of human behavior and may be effective if implemented well.

No evaluation evidence, but adheres to principles of human behavior and may be effective if implemented well.

   

Cost to implement:

$$$

Requires extensive new facilities, staff, equipment, or publicity, or makes heavy demands on current resources.

$$

Requires some additional staff time, equipment, facilities, and/or publicity.

$

Can be implemented with current staff, perhaps with training; limited costs for equipment or facilities.

These estimates do not include the costs of enacting legislation or establishing policies.

   

Use:

 

High

More than two-thirds of the States, or a substantial majority of communities

Medium

One-third to two-thirds of the States or communities

Low

Less than one-third of the States or communities

Unknown

Data not available

   

Time to implement:

Long

More than 1 year

Medium

More than 3 months but less than 1 year

Short

3 months or less

These estimates do not include the time required to enact legislation or establish policies.