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10 Table 2.1. Sample Design (with Target Cell Values) Gender and Primary Age Range Age Range Description One Year Two Years DAS Units Participants Data-Years M 1617 Minor teen 72 28 100 172 200 M 1820 Adult teen 72 28 100 172 200 M 2125 Young adult 72 28 100 172 200 M 2635 Adult 72 28 100 172 200 M 3650 Middle adult 72 28 100 172 200 M 5165 Mature adult 72 28 100 172 200 M 6675 Younger older driver 72 28 100 172 200 M 76+ Older older driver 72 28 100 172 200 F 1617 Minor teen 72 28 100 172 200 F 1820 Adult teen 72 28 100 172 200 F 2125 Young adult 72 28 100 172 200 F 2635 Adult 72 28 100 172 200 F 3650 Middle adult 72 28 100 172 200 F 5165 Mature adult 72 28 100 172 200 F 6675 Younger older driver 72 28 100 172 200 F 76+ Older older driver 72 28 100 172 200 Any Advanced vehicle technology 0 350 350 350 700 Total 1,152 798 1,950 3,102 3,900 groups, as the extremes are where the age-related problems and the availability and quality of existing state or other local tend to manifest. data (e.g., driver licensing, roadway inventories, driver his- tory, and crash data). Of those respondents, 11 contractors were identified as potential SHRP 2 NDS study sites. Nine of Data Collection Sites these prequalified contractors responded to an RFP issued in The objective in selecting the suite of sites for the SHRP 2 NDS March 2009. Proposals specified the details regarding how was to represent to the extent feasible the wide range of driving proposers would go about managing one or more data col- and geographic conditions and other relevant characteristics lection sites and how the sites would contribute to the col- found across the United States. Of course, the sites could not lective balance of the entire suite of sites in terms of the key be selected independent of the site contractors: for each site factors such as geography, weather, state law, road types, and selected, there had to be a suitably experienced contractor who land usage (e.g., urban versus rural). Proposals were evalu- responded to the Request for Proposals (RFP) and proposed to ated on the basis of defined contractor qualifications, includ- manage a site in a particular location. The site contractors must ing human participant research experience; well-trained, be technically qualified for all aspects of the study as well as permanent, full-time technical staff; and sufficient and suit- have (or be able to secure) the necessary facilities to carry out able office, assessment, and garage space. To handle a proj- the data collection plan. Note that each site selected could only ect of this magnitude, in which a typical site will be managing represent some portion of the total environmental diversity up to three times as many primary participant-vehicles as the (i.e., in terms of geographic location, predominant terrain, entire 100-Car Study (Dingus et al. 2006), requires substan- land use, or weather patterns, to name a few key factors). It is tial experience in working with participants and managing important for the NDS to have a broad range of environmen- unanticipated circumstances. Site contractors were selected tal conditions represented to understand these factors in com- on the basis of their individual merits, as well as the collective bination with other driver, vehicle, and roadway factors. representation they bring to the group of selected S07 sites. Potential contractors responded to two rounds of Request Figure 2.1 shows the six sites chosen to serve as the SHRP 2 for Qualifications (RFQ) that addressed the qualifications NDS data collection sites. The sites are also listed below, along of the site contractor, the characteristics of the proposed site, with the contractors who will manage each site.