Flathead County Transportation Plan – Phase II

Flathead County Transportation Plan – Phase II
2.6.2 INTERSECTION CRASH ANALYSIS
Sixteen intersections were evaluated as part of this crash analysis. Three analyses were performed to
rank these sixteen intersections based on different crash characteristics. These three analysis measures
and their results are described in this section.
First, the intersections were ranked by number of crashes. A summary of these intersections, along with
the number of crashes at each intersection, is shown in Table 2.7. The intersections at which no
reported crashes occurred were not analyzed further as part of this crash analysis.
Table 2.7: Number of Crashes at Intersections (Jan 1, 2004 ‐ Dec 31, 2006)
Intersection Type 1
Crashes
Hodgson Road / Whitefish Stage U‐2W 6
West Springcreek Road / US Highway 2 U‐2W 6
Kila Road / US Highway 2 U‐2W 5
Fairmont Road / MT Highway 35 2 U‐2W 4
West Valley Drive / Three Mile Drive U‐2W 3
Whitefish Stage / West Evergreen Drive U‐1W 3
Batavia Lane / US Highway 2 U‐2W 2
Helena Flats Road / East Evergreen Drive U‐2W 2
Whitefish Stage / Granrud Lane U‐1W 2
Columbia Falls Stage / Kelley Road U‐2W 1
Auction Road / Demersville Road U‐2W 0
Beach Drive / Holt Drive U‐2W 0
Best Way / Truck Route U‐4W 0
Helena Flats Road / East Reserve Drive U‐2W 0
Whitefish Stage / Mission Trail U‐1W 0
Whitefish Stage / Winchester Street U‐1W 0
1 “U‐1W" = Unsignalized one‐way stop control; "U‐2W" = Unsignalized two‐way stop control; "U‐4W" = Unsignalized four‐way stop control.
2 This intersection was signalized after the crash data collection and analysis was completed.
The second crash analysis performed involved a more detailed look at the crashes to determine the MDT
“severity index rating”. Crashes were broken out into three categories of severity: property damage
only (PDO), other injury crash, and fatality or incapacitating injury. Each of these three types is given a
different rating: one (1) for a PDO crash; three (3) for a non‐incapacitating injury crash; eight (8) for a
fatality or incapacitating injury crash. The MDT severity index rating for each intersection in the analysis
is shown in Table 2.8. The calculation used to arrive at the severity index rating is shown below.
[(# PDO) x (1)] + [(# Non‐Incapacitating Crashes) x (3)]
+ [(# Fatalities or Incapacitating Crashes) x (8)]
Total Number of Crashes in a Three‐Year Period
= (MDT Severity Index Rating)
2‐24 | P age Existing Transportation System