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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 http://safety.transpportation.org/guides.aspx. 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
