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Guidebook 51 Transportation Case Studies 5 Study Missouri Statewide Installation of Case Median Cable Barriers Value to Sell: A statewide solution to prevent a specific crash type. Context Content The state of Missouri began to focus on improving Results from test sites were summarized in reports traffic safety by reducing cross-median fatalities that were used to promote the program's early after research using the state's database on crash success. The earliest report on the original median sites and crash types concluded that cross-median guard cable located on I-44 indicated the cable had crashes were a major source of traffic fatalities virtually eliminated cross-median fatalities. Other and severe injuries on Missouri roadways. Cross- reports included information on improvements median crashes typically involve head-on collisions, being made to installation design to increase the high speeds, and multiple fatalities. Using median effectiveness of the cable on hills and turns. New cable barriers is a countermeasure to cross- installations were equally promoted to increase median crashes that is both effective and relatively awareness, bringing attention to its eventual inexpensive. These factors eventually resulted in success. When presenting technical content to a a unique situation where the state focused not on nontechnical audience, MoDOT found the use of fatal crash locations (which are random), but on graphs and visual explanations helpful. specific crash types (which are not random), and implemented a statewide solution. Channel and Style Despite the multiple years that it took to deploy Strategy median guard cable as the statewide solution to With a limited budget, the Missouri Department cross-median crashes, many traffic safety engineers of Transportation (MoDOT) installed test sites in and project managers consistently championed locations with a historically high frequency of cross- the program. This advocacy sustained momentum median crash sites. The test methods involved not for the idea of improved safety and saved lives only median guard cable, but also shoulder rumble with a proven and cost-effective countermeasure strips and guardrail improvements. Throughout to a specific crash type. In this MoDOT case, it was the late 1990s, after successful results with the test important for advocates of the program both to sites, additional mileage of median guard cable speak with decision makers and to be persistent in was placed along the interstates. The increased sending emails and letters to keep the issue visible. visibility of test sites to the public and policy makers Increased visibility was also supported through served as references to the project's success and broadcast channels or media sources, such as town provided the advocates of median guard cable the hall meetings and news releases. After the public ammunition they needed when promoting its use became aware of the success of median guard cable, on a statewide level. Persistent advocacy played a the costs of implementing a statewide solution were key role in keeping the topic fresh in the minds of easier to justify. Actively pursing other channels decision makers. of communication, such as webinars and web conferences, helped to further increase awareness of the program.