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REPRESENTATIVE ACCIDENT RATES (Crashes per Million Vehicle-Miles Traveled) by Type of Median- Urban and Suburban Areas Notes: (a) Includes both signalized and unsignalized access points. Source: This data has been taken from Table 2-2, page 17, Transportation Research Board, Access Management Manual. It, in turn, cites as it’s reference: Gluck, J., H. S. Levinson, and V . Stover. NCHRP Report 420: Impacts of Access Management Techniques. TRB, National Research Council, Washington, D.C., 1999 -------------------------------------------------------------------------------- April 1,2006 STATE ROAD 135 ACCIDENT DATA The data and accident rate calculations contained below are for the 1.93 mile segment of State Road 135 between County Line Road and Smith Valley Road. 1) City of Greenwood Police Department accident response. 2005 accident reports: 2158 Accidents on 135 in 2005: 378 Percentage = (378 / 2158 ) X 100 = 17.5 % FACT #1: 17.5% of the accidents in the city of Greenwood occur on a 1.93 mile stretch of road. 2) Road segment accident rate (crashes per million vehicle-miles traveled). 24 hour traffic volume: 33,866 vehicles (a) (a) Reference: December 2004 Wal Mart Traffic Impact Report Traffic volume-distance rate: = 33,866 cars/day X 365 days/year X 1.93miles = 23.86 million vehicle miles / year Accident rate: A.R. = 378 accidents per year / 23.86 mvm/yr = 15.84 accidents /million vehicle miles FACT #2: The accident rate on this segment of road is TWICE the expected rate. May 24,2006 U.S. 31 ACCIDENT DATA The data and accident rate calculations contained below are for the 2.25 mile segment of U.S. 31 between County Line Road and Smith Valley Road. 1) City of Greenwood Police Department accident response. 2005 accident reports: 2169 Accidents on U.S.31 within city limits 575 Accidents on U.S.31 between County line & Smith Valley 380 Percentage = (380 / 2169 ) X 100 = 17.5 % 2) Road segment accident rate (crashes per million vehicle-miles traveled). 24 hour traffic volume: 42,310 vehicles (a) (a) Reference: INDOT measured between Fry Road and County Line Road in 2000. When a 2% annual growth rate is applied, this becomes 46,714 Traffic volume-distance rate: = 46,714 cars/day X 365 days/year X 2.25 miles = 38.364 million vehicle miles / year Accident rate: A.R. = 380 accidents per year / 38.364 mvm/yr = 9.9 accidents /million vehicle miles |
an alliance of White River Township neighborhood associations and individuals |
WRCU Testimony to the joint Indiana House and Senate Regulatory Flexibility Study Committee on the matter of the Bargersville Water Utility rate increase process |
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| Two-Way Left-Turn Median |
| Total Access Points per Mile (a) |
| 20-40 |
| Median Type |
| >60 |
| 7.9 |
| 5.1 |
| Undivided |
| 9.2 |
| 3.8 |
| Non-Traversibl e Median |
| <20 |
| 40-60 |
| 2.9 |
| 9.4 |
| 5.9 |
10.6
| 7.3 |
| 6.8 |
| 3.4 |
| 8.2 |
Mr. James Ude INDOT Planning Department Seymour District 185 Agrico Lane Seymour, Indiana 47274 Subject: Request for State Road 135 Safety Analysis Reference: 1) WRCU 2006-001, Infrastructure Access Optimization, State Road 135 2) Transportation Research Board Access Management Manual 3) Wal-Mart Traffic Impact Study, December 2004 Dear Mr. Ude, The members of the White River Citizens United group respectfully request that INDOT perform a Safety Analysis of State Road 135. Of particular concern is the segment between County Line Road and Smith Valley Road. It is our contention that an excessive number of accidents occur in this segment of the road. We believe that the unlimited center left turn lane, the lack of right turn deceleration lanes, the excessive number of highway access points, and the current traffic volume contribute to an accident rate that is above the normally expected rate. We have given some independent thought to this safety issue. One segment of our analysis is based on data obtained from the Greenwood Police Department. In 2005 they processed 2158 total accident reports. Of this, 378 were for accidents on State Road 135 between County Line Road and Smith Valley Road. Thus, that section of approximately 1.93 miles of road was responsible for 17.5% of the city’s accident reports. We consider that indicative of a public safety concern. In 2004, there were also 365 accidents in this same area. The intersection of State Road 135 and Smith Valley Road (County Road 900N) accounted for 148 accidents (20% of the total) for this two year period. A second segment of our analysis is based on the expected accident rate expressed in incidents per million vehicle miles as compared to the actual. Page 17, Table 2-2, of the Transportation Research Board Access Management Manual indicates that an accident rate of 7.9 (accidents/million vehicle miles) is to be expected for a highway having 40 to 60 access points per mile, and a “two way left turn” center lane configuration. These conditions match the configuration of State Road 135 in the region of interest. The December 2004 traffic impact study generated in support of the Wal-Mart petition to build a store at Smith valley Road and State Road 135 reports in Appendix A, page 5, that the 24 hour traffic volume was 33,866 cars. If one assumes this traffic volume constant each day of the year, the traffic distance- volume rate is: 33,866 cars/day X 365 days/yr. X 1.93 miles = 23.86 million vehicle miles/yr. The accident rate is: A.R. = 378 accidents/yr. / 23.86 mvm/yr. = 15.84 accidents/mvm This calculation reveals an accident rate that is twice the expected rate. Again, we consider this to be indicative of a public safety concern. The TWLTL (Two Way Left Turn Lane) configuration is reported on page 202 of the TRB Access Management Manual to be appropriate when average traffic volume is less than 24,000 vehicles per day. It would then appear that State Road 135 has exceeded its safe capacity limits, and the excessive accident rate is the result. We look forward to an INDOT Safety Analysis and the resulting recommendations. Please advise us if we can be of any assistance. Forrest Mellott John Griffin CC: Rep. W. Burton Mr. E. Ferguson Rep. D. Frizzell Chief J. Pitcher Sen. M. Young Sen. B. Waltz |
