Accident Rates for State Road 135 and US31April 1, 2006

    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


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    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









Median Type
Total Access
Points per Mile
(a)
 Undivided
 Two-Way
Left-Turn
Median
 Non-Travers
ible
Median
<20
 3.8
 3.4
 2.9
20-40
 7.3
 5.9
 5.1
40-60
 9.4
 7.9
 6.8
>60
 10.6
 9.2
 8.2