FEG Conference Penrith Colin JT Mackenzie BSc BSc(Eng) CEng MICE FIHT Project Consultant to the Highland Timber Transport Group

Structure of Presentation Introduction The rise of the Super Single Road Friendly Vehicles The Crystal Ball 23/10/2007Colin JT Mackenzie2

Introduction: What is the Problem? 23/10/2007Colin JT Mackenzie3

The rise of the Super Single Twin wheels Super Singles COST 334: Super Singles superior in Safety Running costs Environment BUT Highly damaging to fragile local roads - x7! 23/10/2007Colin JT Mackenzie4

Road Friendly Vehicles Key issue: How do we make timber trucks less damaging to roads? Make tyre footprint as big as possible Increase tyre width Lower the tyre pressure Use multiple wheels 23/10/2007Colin JT Mackenzie5 Tyre Footprint

The John Scott LGP system 5 years development by JST Two basic systems: Case 4x4 tractor plus trailer(s) Volvo 6x6 plus trailer Different systems, different uses 23/10/2007Colin JT Mackenzie6

Rear Suspensions Balance beam Case: McCauley And multi wheel Volvo: King 23/10/2007Colin JT Mackenzie7

23/10/2007Colin JT Mackenzie8

Volvo 80t Gross 45t load Off public road Red Diesel Economy Best for deep forest high volume haulage to transhipment point Best with exclusive use of road 23/10/2007Colin JT Mackenzie9

Case tractor and trailer 23/10/2007Colin JT Mackenzie10

Case 32t Gross 15t+ Load Can cope with poor roads On and off public road Good for short hauls outside forest but no crane Well suited to ‘all in’ roading and haulage contract 23/10/2007Colin JT Mackenzie11

Central Tyre Inflation (CTI) Onboard computer controls tyre pressure Lower speed, lower pressure, greater traction Excellent feedback. ROADEX report in November 4+ units now in use in Scotland 23/10/2007Colin JT Mackenzie12

Super Super Singles Wider, lower profile tyre Bigger footprint As good as twin wheels? 23/10/2007Colin JT Mackenzie13

SSS Equipped truck 23/10/2007Colin JT Mackenzie14

Which tool to use 23/10/2007Colin JT Mackenzie15 Situation Conventional (super single artic) Specialist (twin wheel or SSS &CTI equipped) Tractor +LGP trailer (15t payload) Specialist LGP (45t payload) Served by agreed route (and short distance in forest) Served by weak consultation route (and short distance in forest) Hauling to nearby transfer stockpile Short/medium in-forest haul to stockpile (0- 20km round trip) Long in-forest haul to stockpile (10km+ round trip)

The Crystal Ball Road friendly vehicles Sharing of data A more holistic approach to transport procurement 23/10/2007Colin JT Mackenzie16

Thank you! 23/10/2007Colin JT Mackenzie17