Gentlemen,

Please find enclosed the reference: “ Priest, A.L., Timm, D.H., and Barrett, W.E. 2005. Mechanistic comparison of wide-base single vs. Standard dual tire configurations. NCAT Report 05-03, National Center for Asphalt Technology, Auburn University, Alabama.” .  This report can also be directly downloaded on the web site: http://www.ncat.us/info-pubs/technical-reports.html .

Best regards

Damien Grellet, Ph.D. Candidate

Chaire industrielle du CRSNG sur l’interaction Charges Lourdes – Climat – Chaussées

Université Laval, département de génie civil

Pavillon Adrien-Pouliot, 1065 ave.de la Médecine

Québec (Québec), Canada, G1V 0A6

Dear colleges and gentlemen,

I am carefully reading all the information because in the Netherlands we are currently thinking about measurements that can be taken to reduce the damage that is caused by heavy road haulage vehicles.

In the article that I received this morning from Glen Légère (RCGC2012, Grelet) is stated that the first generation of wide base tires (385/65R22.5 and 425/65R22.5) were found to cause a significant increase in pavement damage compared to conventional dual tires (COST 334, 2001). Grellet states on page 527 that several field and theoretical studies have shown that there is not a significant difference in pavement response between WBST and conventional dual tires.

Does anyone have the article which is referred to in the statement above (Priest et al. 2005) and may I receive a copy?

In practise we see in the Netherlands that this new generation of tyres is not used often on trailers that are allowed 9 or 10 tons per axle. An example of what the tyre manufactures are offering to the road haulage companies as innovative and new is stated on this website:

http://www.conti.nl/nieuws/continental-completeert-htr2-bandenlijn-voor-trailers/#

English translation: Continental provides the successful HTR2 tire for trailers in the size 425/65 R 22.5. This completes the HTR2 series. The HTR2 tires are particularly suitable for trailers of distribution trucks that operate nationally or regionally. Important advantages are the low rolling resistance and long life. The HTR2 line is developed for trailers that are used for national transport (distribution). The new 425/65 R 22.5 version has a load index of 165, tire is suitable for vehicles with 10-ton axles.

I am wondering how we can arrange policy to assure that new WBST generation is used in the transportation of heavy goods instead of decreasing width of tyres that is currently the direction of development in tire manufacturing.

Can anyone help me with ideas?

Best regards and thank you for your reply,

Mr. Jan Hordijk
Civil engineer on road construction and freight transportation

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Directorate-General of Public Works and Water Management 
Centre for Water, Traffic and Environment
Postbox 5044
2600 GA Delft
The Netherlands

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Telefone:  +31 62 16 69 637
E-mail: [log in to unmask]
Internet: www.Rijkswaterstaat.nl/en
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Van: Technical, operational and economic aspects of road freight transportation [mailto:[log in to unmask]] Namens Glen Legere
Verzonden: vrijdag 12 april 2013 1:13
Aan: [log in to unmask]
Onderwerp: Re: Tyre research

Gentlemen,

Enclosed, two articles from Laval University.

Regards, Glen

I am seeking assistance to identify references to research undertaken in the last 5 or 6 years comparing the pavement effects of wide single tyres with conventional dual tyres.

In Australia, a full scale ALF test was undertaken comparing the deformation of a 445/50R22.5 tyre with a dual set of 11R22.5 tyres.  The results are shown below.

I would be pleased to receive information about similar tests or research in countries other than Australia.

Bob Pearson

PTRC Australia

Email: [log in to unmask]

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