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59 SECTION VII Illegal Driver Actions Planning Programs Related treatment-choice procedures will be presented for treatments to Reducing Crashes Involving related to drinking drivers. Aggressive Drivers, Alcohol-Impaired The safety planning team is strongly urged to carefully Drivers, and Unlicensed review the material in each of the pertinent guides before or Suspended/Revoked Drivers beginning the planning process. These user-population- oriented guides are found within NCHRP Report 500: Guidance This section of the guide presents a strategy for selecting for Implementation of the AASHTO Strategic Highway Safety treatment programs that offer maximum potential in reduc- Plan. The specific volumes pertinent to this section on illegal ing crashes involving aggressive drivers, drinking drivers, driving acts are: unlicensed drivers, and drivers with a suspended or revoked driver's license (S/R drivers). As noted earlier, it is assumed Volume 1: A Guide for Addressing Aggressive-Driving Colli- that a safety planning team has selected one or more of the sions. (1) above emphasis areas as part of its safety plan and has estab- Volume 2: A Guide for Addressing Collisions Involving lished a "stretch goal" as described in Section I. Four proce- Unlicensed Drivers and Drivers with Suspended or Revoked Li- dures for choosing treatment strategies and target groups censes. (2) were described in Section III of this guide. Three of these Volume 16: A Guide for Reducing Alcohol-Related Colli- procedures require known estimates of effectiveness (crash sions. (16) reduction and benefit-costs) for some or all of the selected strategies in other words, that the treatments have known A link to these downloadable guides can be found in CRFs or AMFs. However, none of the guides considered here The planning identified strategies that completely met this requirement team is also encouraged to review NCHRP Report 501 (18) for even though many of the strategies are supported by com- a detailed description of an integrated problem identification pelling evidence of significant crash reduction. What is and safety planning process. generally lacking are precise estimates of the magnitude of the crash reduction that could be used in the development of General Strategic Considerations an estimated B/C ratio. The latter, in turn, also requires known estimates of treatment costs and effects on crash As noted earlier, data for estimating precise AMFs, CRFs severity, which are often lacking. Thus, we know in some and B/C ratios for many of the driver-oriented strategies do cases that the treatment reduces crashes but not by how not exist. There are also some other differences between much or in terms of net cost-benefits. highway-oriented strategies and driver-oriented strategies Procedure 3, as described in Section III, outlined an ap- that need to be recognized in selecting treatment programs proach for selecting strategies in the absence of known crash and establishing crash-reduction goals. The first relates to the effectiveness estimates (AMFs or CRFs) and B/C ratios. This data source and "ownership" of the treatment delivery sys- procedure is designed for use with treatments where crash tem. In contrast to many of the highway countermeasures, reduction effectiveness has not been established. Many of the most of the effectiveness measures for these driver strategies treatments related to illegal driving fall into this category, and do not relate to crash rates on sections or type of roads. In- that procedure will be presented below. Two additional stead, the safety concern usually relates more to overall crash