UKTC Archive

RE: Trees and Speed

Subject: RE: Trees and Speed
From: Barber, Helen
Date: Dec 01 2000 15:49:25
the only way trees are going to reduce the speed of motorists is by reducing
vision. Is this something we really want to promote to the General Public
bearing in mind reduced vision = reduced safety = more complaints to fell
trees?. I think you are fighting a loosing arguement with this one wether
there is research to back it up or not.

-----Original Message-----
From: Tony Ash []
Sent: Friday, December 01, 2000 3:33 PM
To:   UK Tree Care
Subject:      RE: Trees and Speed

This rings a bell.  I remember coming across something to do with tree
streets having the effect of slowing down traffic.  I shall think hard
the weekend, so if you hear a grinding noise in the East London area, its
brain trying to get into gear.  Hopefully somebody else reading this may
know of the particular research.

It seems to make sense; if you were driving along a flat barren stretch of
road, you wouldn't have the same perception of speed and may be inclined
drive fast;  whereas a tree lined road may have the opposite effect due to
the parallax effect;  i.e. distant objects appearing to move slowly while
near objects move by much quicker although you are driving along at the
speed.  So tree lined streets may make you think you are driving faster
you are so you may be inclined to slow down more.  Mind you, I don't think
the local joyriders give 2 hoots about the parallax effect. 

The other way to do it, of course, is to plant trees in the road rather
on the pavement.  That'll make the bounders slow down!!  We have old
photographs here showing some old Chestnuts actually growing in the road
just off the side of the pavement.  Needless to say, they've now gone and
been replaced by (not) fastigiate hornbeam, mundanely sitting on the
pavement.  Highway engineers just aren't imaginative these days! 



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