UKTC Archive

FW: Windshield/Drive-by | Speed Limit

Subject: FW: Windshield/Drive-by | Speed Limit
From: Jeremy Barrell
Date: Nov 27 2019 17:14:50
Maybe the internet access is not that good in Tasmania, but there has been 
quite a lot of information available about drive-by surveys for quite a while 
now:

  *   This article by Rooney et al, was published in 2005 
https://pdfs.semanticscholar.org/afcd/e7a31161e8adb92c02c6e6d6b569aab0733d.pdf
  *   LANTRA has been delivering from earlier this year a course specifically 
designed for highway tree inspections that includes guidance on drive-by 
surveys https://www.lantra.co.uk/course/highway-tree-inspection
  *   In November last year, I published the BTC Tree Information Note (TIN) 
Tree risk management for duty holders, which sets out key requirements likely 
to be necessary for drive-by surveys that can be accessed here 
https://www.barrelltreecare.co.uk/assets/Uploads/BTC134-TIN1-151118.pdf.
  *   Finally, and probably most relevant, is the PFD Report issued by the 
Coroner from the Warren Inquest in 2012, which identified important elements 
that a drive-by survey should include that can be reviewed here 
https://www.barrelltreecare.co.uk/assets/Uploads/D05-Inquest-verdict-and-PFD-Report-Warren-2014.pdf

In case you can’t access my guidance, here is the relevant section, but it 
should be read in the wider context set out in the full TIN:

“Driven or drive-by check:  A check from a moving vehicle can be called a 
driven check or a drive-by check, and involves a vehicle being driven at low 
speed by a driver and a separate spotter looking at trees.  Indications of 
what a drive-by check should entail was published by the Coroners Office in 
2014 in the form of a Prevention of Future Deaths (PFD) Report arising from 
the Inquest of Michael Arthur Warren.  Although a widely accepted drive-by 
check definition has yet to emerge, from this PFD Report and other 
references, a likely expectation is that spotters must only look at trees, 
and not be attempting to assess highway and tree issues at the same time.  
Where significant trees are present on both sides of the road, each side 
should be driven separately, and spotters should not attempt to look at both 
sides of the road during one pass.  The vehicle should be prepared to stop to 
allow a closer visual check for obvious safety conditions and other triggers 
of possible threats to the highway.  Triggers to stop should include seeing 
the ‘obvious defects’ listed above, but additionally may include, but not 
necessarily be limited to, large/mature poplars and willows (because they 
decay quickly), and large/mature beech (because they are often vulnerable to 
infections from Meripilus sp and other serious decay fungi).  One of the 
disadvantages of a driven check is that only defects visible from the road 
view can be seen, and serious defects out of sight from the road could be 
missed.  For this reason, although driven checks are useful within an overall 
management regime, it may be necessary to supplement them with walked checks, 
which can be at less frequent intervals.  However, the combination of driven 
and walked checks would be a matter to be assessed in each situation, and it 
would unrealistic to describe a rigid formulaic approach that can be applied 
to all circumstances.”


Jeremy



Jeremy Barrell​
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