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State Farm, the nation’s largest auto insurer, distributed a list of the 10 most dangerous intersections in the United States based on crashes resulting in claims by its policyholders. What started as a study to reduce risk turned into an ongoing study that directs a major public relations effort: State Farm provides funds for communities to further research their dangerous intersections and initiate improvements based on the research. This case tells you how the State Farm Dangerous Intersections initiative got started and how it is done.




>The Scenario




State Farm Insurance has a rich history of proactive safety involvement in auto and appliance design to reduce injury and property loss. In June 2001, State


Farm Insurance, Inc., released the second report in its Dangerous Intersection reporting series. State Farm modeled its program after an initiative by the Insurance


Corporation of British Columbia, Canada (ICBC), and the American


Automobile Association of Michigan (AAA) to help position the nation’s largest auto insurer as the most safety-conscious insurer. ICBC had patterned its program on an earlier effort in Victoria, Australia. AAA, in turn, benchmarked its program on the ICBC program. AAA invited State Farm to help fund one of its intersection studies. State Farm saw this as an opportunity to expand its effort into a nationwide campaign in 1999. “The 2001 study is part of a larger effort focused on loss prevention and improving the safety of intersections around the U.S.A.,” shared State Farm research engineer John Nepomuceno. State Farm has allocated significant resources as well as funds to the initiative. Since its inception, every city with an intersection on the overall list of dangerous intersections is eligible to apply for a $20,000 grant to defray the cost of a comprehensive traffic engineering study of the intersection. Additionally, each city named to the national top 10 dangerous intersection list is eligible for a grant of $100,000 per intersection to defray some of the cost of making improvements. All totaled, State Farm offered $4.44 million to the safety initiative in its first year.


Due to its large market share, State Farm is the only U.S. insurer in a position to mine its databases for the requisite information on accidents to come up with a viable U.S. list. But it found that although it had the interest to do so, its data warehouse did not have sufficient information to tally accident rates for intersections. To rectify this, in 1998 State Farm included a location field as part of the data that its claims adjusters regularly complete. This location information, in open-text format, indicates whether the accident took place in an intersection or as part of an incident related to an intersection accident, and identifies the intersection.


Following the 1999 study, the fields for identifying intersections were further refined.


In the first study using 1998 data (reported in June 1999) as well as the


2001 study, State Farm looked at accidents involving only intersecting roads.


They excluded any accident that occurred at the intersection of a road and a highway access or egress ramp. State Farm also looked only at accidents where the State Farm–insured driver was at fault.


Because of the study’s focus on road safety engineering, the first study ignored accident severity and made no attempt to isolate demographic (age or gender of driver, driving record, etc.) or geographic (weather conditions, population of area, etc.) factors related to the accident. It also looked only at State Farm’s own internal incident reports, not at any public records involving traffic patterns or volume or police incident reports. Based on industry market share information, State Farm was able to estimate the total number of crashes at a given intersection. “There was good reason to exclude police reports and traffic counts,” explained Nepomuceno. “The reporting threshold for police filing reports on accidents differs widely from jurisdiction to jurisdiction. Some will only fill out reports when personal injury or criminal behavior is involved. Others will fill them out only when a vehicle is damaged to the degree that it needs to be towed from the scene. Still others fill out such reports on every incident. Traffic volume reports are often prepared infrequently and often by independent sources. Not only may the data quality be questionable, but the time period in which the data was collected may not match our 1998 incident reports in every city involved. Also, when traffic volumes are factored in, low volume roads with relatively few crashes are often deprioritized. Now that we’re through with the 2001 study, we are asking ourselves if intersection volume should be factored in, and if so, how it can be included without significantly increasing our effort in data processing.”


In the 1998 study, State Farm identified 172 dangerous intersections. The top 10 most dangerous intersections in the United States were released publicly ( com). Public affairs staff for each state could request that up to 10 intersections be identified for their state. “This was usually determined by the resources that our local public affairs staffs were willing to put toward the program,” shared Nepomuceno. “Each state had to recognize a top 10 national intersection, but they could request that no more be released or that up to 10 intersections within their state be released.” As of August 2001, 97 cities (56.4 percent) had applied for State Farm grants.”


While some in the media claimed we had ‘hit a home run’ with the program, we quickly learned that there was a lot more at stake than we had anticipated in generating goodwill with transportation engineers,” indicated Nepomuceno. “This is, after all, a traffic safety program and we would not achieve that goal without having the cooperation of the traffic and transportation engineering community. First, while initially they lauded us for the attention our listing brought to traffic concerns, we and they soon discovered that the spotlight generated demand for immediate solutions, solutions that they often didn’t have budgets to implement. Also, from their perspective, not all accidents are the same; locations with accidents that result in injuries and death should be given more attention. Some jurisdictions were upset that we didn’t consider intersection volume and we didn’t include accident rate data.1  The fact that the State Farm grants were intended to study the intersection more completely wasn’t always seen as a solution to their immediate problems.”


To include accident severity, State Farm needed a measurement system for classifying accidents. For the 2001 study, which used 1999 and 2000 accident data, State Farm calculated a median property damage accident payout (approximately $1,700). Incidents requiring payout of more than the median amount were classified as “high severity”; those requiring less, “low severity.” Additionally, State Farm chose to classify each accident using a multipoint scale. Zero was assigned to “no property damage, no personal injury” incidents and a higher number was assigned to “High property damage, personal injury” incidents, with numbers in between assigned to levels of property damage and personal injury (see Exhibit SF 1–1). Accident scores were summed to create an aggregate danger index for each intersection. Each intersection was then weighted by dividing the danger index by State Farm’s market share in the area. Of the 224 intersections identified, the top 10 were released to the national media. Each of those 224 is now eligible for the $20,000 grant to study the intersection to identify specific improvements; the top 10 are also eligible for $100,000 grants for improvements. In this second round, State Farm has committed $5.48 million to the safety program.


Exhibit SF 1–1 Danger Codes


No Personal Injury      With Personal Injury


No property damage                           0                                  Y


Low property damage                         1                                 1 + Y


High property damage                        X                                 X + Y




State Farm is making plans to track the success of the Dangerous Intersection program. Once cities notify them of the completion of an intersection’s improvements, State Farm will start tracking accidents for that intersection for a period of one year. The first post-improvement evaluation study is expected in 2002. Additionally, State Farm is taking steps to learn from the characteristics of the dangerous intersections. Each grant application for an affected city’s study of a dangerous intersection must include:


· Collection and analysis of police report data.


· An engineer’s “geometric review”2of the intersection.


· A capacity profile of the intersection.


· A traffic conflict study.3


· A benefit-cost analysis.


· A schedule of improvements (short-term, intermediate-term, and long term).




Answer the following questions:




 1. Identify the various constructs and concepts involved in the study.




 2. What hypothesis might drive the research of one of the cities on the top 10 dangerous intersection list?




 3. Evaluate the methodology for State Farm’s research.




 4. If you were State Farm, how would you address the concerns of transportation engineers?


in text citation, reference.

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