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Vegetation Behind Barrier Systems

Question
State NE
Description Text

At what point would the
vegetation behind the guardrail be too thick that it may change the way the
guardrail works?



Varying degrees of …



Trees:  4”+ as in the
roadside design guide.



Evergreen bushes: Does size of
the braches or height have guidance?



Shrubs: ?



Grasses: ?

Keywords
  • Guardrail
Other Keywords Vegetation
Date September 5, 2017
Attachment 008.JPG
Attachment 009.JPG


Response
Response

Here is my first impression:

 

I would expect small annual and perennial flowers to be acceptable and not drastically change vehicle-barrier performance.

 

I would expect small to medium, largely-spaced bushes (shrubs) or medium to tall, moderately-spaced natural grasses to be acceptable and not drastically change vehicle-barrier performance.

 

I may expect large, largely-spaced bushes or tall, closely-spaced, clumped, natural grasses to be acceptable and minorly change vehicle-barrier performance.

 

I may expect large, closely-spaced bushes to be marginally acceptable and cause concern for vehicle-barrier performance.

 

I may expect small, largely-spaced trees to create marginal safety performance and moderately change vehicle-barrier performance.

 

I would expect presence of 2 to 4” diameter trees near barriers to cause concerns: ramping, excessive OIV, etc.

 

Date September 6, 2017


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