Drive-by/Windshield tree risk assessment

2020-07-14 2:13 PM | Admin (Administrator)

Here’s our Drive-by Assessment specification that we've been working on the Tasmanian Government's Department (DSG) of State Growth.  This is now embedded into the Government Agency Tree Risk-Benefit Management Strategy template at Appendix A2.

Tree Risk Management & Assessment | Drive-by Windshield Assessment

DSG are working on their Traffic Management Plan and I'll encourage them to share that as well. This is really important because the risk of assessing trees on a high-use road is much higher than the risk of branches or trees falling on a high-use road.

It can be adapted to meet your needs. By way of explanation for how this is set up. It’s part of the Government Tree Risk-Benefit Management Strategy. So, you’ll need to be familiar with that to understand the difference between Passive Assessment & Active Assessment. And the three levels of Active Assessment – Basic, Detailed, and Advanced.

Zones of high confluence = High use + large trees

In VALID that’s 1400 or more vehicles a day. The speed limit doesn’t matter. For people, we’re looking at around 1200 per day. This translates to someone passing every minute or so between 7am – 7pm, Mon – Fri.  Large trees, for purposes of zoning rather than assessment are trees with a DBH of about 50cm/20in or more.

Drive-bys can be carried out by a Basic Validator or a Validator.  This is released under a creative commons licence, and you're welcome to replace these trained assessor titles with whoever would be carrying out a Drive-by Assessment and what their credentials are.


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