Project: Heavy Goods Vehicle Road Loading of Super Single Tyres

Reference: S120I/VE

Last update: 19/09/2003 15:58:59


The project will quantify road loadings as a result of the use of super single tyres and establish the National effects together with quantifying the economics. If appropriate, the report will recommend regulatory improvements which promote the Departments goals on environmental and road safety improvements.

This original objective was later augmented to merge the same tasks and methodology into the COST 334 study involving a wide range of European partners.


Road rutting is a common road surface failure requiring remedial action and the resulting congestion and pollution are contrary to the Departments objectives. Rutting risks would seem to increase when using super single tyres because they spread the same loads over a narrower band of road with research suggesting that the effects are as strong as those for suspension design.

This project will put these observations and suggestions into an objective framework, indicating the future of research by assessing the economical options.


TRL Limited
Crowthorne House, Nine Mile Ride, Wokingham, Berkshire, RG40 3GA
+44 (0)1344 773131

Contract details

Cost to the Department: £268,150.00

Actual start date: 01 September 1994

Actual completion date: 31 December 2000

Summary of results

  1. The research looked at the whole life costs of using super single tyres in place of conventional twin tyres. Although they increase road damage in comparison to twin wheel operation the benefits of using wider tyres more than offsets the extra damage caused. This benefit is increased when real world effects such as axle bending and unequal tyre pressures are taken into account.