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Effectiveness: 1 Star Cost: $
Use: High
Time: Medium

This countermeasure involves a probationary feature included in the intermediate phase of many graduated licensing systems, which is commonly referred to as contingent advancement. Typically, contingent advancement means that an intermediate license holder must maintain a violation free driving record for a specified amount of time before they can obtain a full license.

Effectiveness: The few evaluations of early stand-alone probationary license systems generally found no substantial benefits (McKnight & Peck, 2003; Simpson, 2003). No recent evaluations have attempted to separate out the effect of penalties for GDL or other traffic law violations from the overall effects of GDL. There are insufficient evaluation data available to conclude that the countermeasure is effective.

Further information about the known research, potential effectiveness, costs, use, and time to implement is available in Appendix A6, Section 1.7.