Approach Turn Crashes
Approach turn crashes occur when someone turns left in front of oncoming traffic without yielding the
right of way. There are two main causes of approach turn crashes:
1) Poor estimation of distance and/or speed of approaching through traffic -- These accidents occur at
both signalized and unsignalized intersections. Poor visibility can contribute to these accidents.
Offset left turn lanes can result in vision obstructions as shown in the illustration below. Note that
this offset created between opposing left turn lanes is a disadvantage of raised medians at
intersections.
2) Inappropriate response to the onset of the yellow or red signal display – This situation can occur at
signalized intersections where permissive left turns are allowed. A driver waiting to turn left on a
green ball at a signalized intersection is required to yield the right- of-way to opposing through traffic.
When the traffic signal turns yellow and/or red, some left turning drivers assume that oncoming
traffic will stop. This causes them to turn in front of oncoming traffic that may not be able (or willing)
to stop.
Approach Turn Crashes by Location
The chart at right shows both the number
and percentage of approach turn crashes
by location and type of intersection for
the past five years.
The majority of approach turn crashes
(more than 70%) happen at signalized
intersections. The combination of
increased complexity and higher turning
volumes along with the issue of turning
on the yellow/red explain this trend.
Private
Driveway /
Alley, 12%
Unsignalized,
15%
Nonintersection,
2%
Signalized
Intersection,
71%
24
Approach Turn Crashes
1/1/2010 - 12/31/2014
E Douglas Rd
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E County
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E Trilby Rd
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S US Highway 287
Carpenter Rd
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State
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E County Road 30
1:60,000
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3-7
8 - 16
E County
Road 38
S County
Road 9
W Trilby Rd
S County Road 19
Strauss Cabin Rd
E Harmony Rd
S County
Road 7
W
Ziegler Rd
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S Shields St
W Boardwalk Dr
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S Taft Hill Rd
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S Overland Trl
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W Drake Rd
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38E
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Y
X
W
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W Prospect Rd
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W Elizabeth St
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E County Road 48
S
S Howes St
W Mulberry St
EL
E Mountain
Ave
W Mountain Ave
E Suniga
Rd
E Vine Dr
³
I
Laporte Ave
N
Timberline Rd
N Howes St
N Mason St
W Vine Dr
E County Road 50
Mountain Vista Dr
N Lemay Ave
N Shields St
E
Willox
Ln
N Taft Hill Rd
Country Club Rd
W Willox Ln
E County Road 52
Main St
É
Z
Y
X
W
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S County Road 5
G
E County Road 54
N County Road 9
County Road 54G
W Douglas Rd
Giddings Rd
N County
Road 19
7
N Overland Trl
28
N County Road 17
N
Hi US
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Turnberry Rd
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17 - 29
30+
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Printed: 4/17/2015