Performance Measures . . . 169
Overview . . . 170
Accessing Performance Measures . . . 171
Severity . . . 172
Circumstance . . . 173
Crash Type . . . 174
Driver/Vehicle . . . 175
Location . . . 176
SMS
15.
15. Performance Measures
Overview
The Performance Measures Package displays counts and rates (exposure) for crashes and their severity (number of people injured or killed). These values are displayed annually for all public roadways in the State of Michigan. Some of the performance measures can be viewed at a statewide, district, or legal system grouping by selection in an option group.
Similar performance measures are grouped together in SMS. These groups or "categories" of measures are Severity, Circumstance, Crash Type, Driver/Vehicle, Location, and Miscellaneous. Not all measures include a rate calculation. If AADT data is not available for that particular measure then no rate is given.
The following formula is used to calculate a rate which is a count per 100 Million Vehicles Miles of Travel:
Rate = (Count * 10 exp 8)/(365 *(Sum of ) Length * Weighted AADT), for a given year, where,
Count = Crash count of number of people
Weighted AADT = (Sum of ) (Length * AADT) / (Sum of ) Length, for a given year. At the statewide and district level AADT information in the form of Vehicle Miles of Travel (VMT) is used to calculate rate. VMT, which is provided by the Bureau of Planning , is equal to Length * AADT.
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Accessing Performance Measures
To access Performance Measures the user will selectTools|Performance Measures from the main menu. As a result the Performance Measures dialog box will open, as illustrated below.
The user will now select the desired category of measure and then click OK to open the corresponding performance measures window. Each category is covered separately in the following sections.
In each category there are often many pages of data, and multiple options per page. Only one representative window of each category will be illustrated in the manual.
Note that in many windows the data displayed may be sorted, filtered, graphed, and exported by the user. For more information on these procedures, see the following pages:
Sorting: See page ?. Filtering: See page ?. Graphing: See page ?. Exporting: See page ?.
15. Performance Measures
Severity
This window is accessed through the Performance Measures dialog box, as discussed on page ?.
By default data is displayed forStatewide, as is indicated by the selected option. The user can view the data for District or Legal System by simply selecting the desired option.
There are six pages of information associated with this window. The Fatality Count page is displayed by default, and is illustrated above.
The other five pages are as follows, and are accessible as menu options available under the Options
button.
Injury Count Fatality Rate Severity Count Injury Rate
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Circumstance
This window is accessed through the Performance Measures dialog box, as discussed on page ?.
As is illustrated above, this window has four layers for Time, Weather, Surface Condition, and Alcohol, accessible to the user by clicking on the window tab.
Many layers have multiple pages of information (listed below), with each page having Statewide, District, and Legal System options. Multiple pages are accessed through the Options button. Single pages are displayed by default.
Tab Pages
Time Crash Count by Hour Crash Count by Day of Week Crash Count by Month Holiday Crashes
Crash Rate by Hour Crash Rate by Date of Week Crash Rate by Month
Weather Crash Count by Weather Crash Rate by Weather
Surface Condition Crash Count by Surface Condition Crash Rate by Surface Condition Alcohol Alcohol Related Crash Count
15. Performance Measures
Crash Type
This window is accessed through the Performance Measures dialog box, as discussed on page ?.
As is illustrated above, this window has three layers for Crash Type, Train, and Animal, accessible to the user by clicking on the window tab.
Many layers have multiple pages of information (listed below), with each page having Statewide, District, and Legal System options. Multiple pages are accessed through the Options button. Single pages are displayed by default.
Tab Pages
Crash Type Crash Count by Crash Type Crash Rate by Crash Type Train Train Related Crash Count
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Driver/Vehicle
This window is accessed through the Performance Measures dialog box, as discussed on page ?.
As is illustrated above, this window has two layers for Age and Driver Restraint, accessible to the user by clicking on the window tab.
Many layers have multiple pages of information (listed below), with each page having Statewide, District, and Legal System options. Multiple pages are accessed through the Options button. Single pages are displayed by default.
Tab Pages
Age Age of Drivers Involved in Fatal Crashes Age of Pedestrians / Bicyclists Killed Age of Persons Killed
Driver Restraint Driver Restraint Counts
15. Performance Measures
Location
This window is accessed through the Performance Measures dialog box, as discussed on page ?.
This category has only the one tab, one page, as illustrated above, with options for Statewide, District, and Legal System.
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Miscellaneous
This window is accessed through the Performance Measures dialog box, as discussed on page ?.
As is illustrated above, this window has one tab for Level of Service.
The layer has multiple pages of information (listed below), with each page having Statewide, District, and Legal System options. Multiple pages are accessed through the Options button.
Tab Pages
Level of Service Crash Count by Level of Service Crash Rate by Level of Service
