Witg adiet• toff eta
22nd April 1977, Page 27
22nd April 1977
Page 27
Page 27, 22nd April 1977
— Witg adiet• toff eta
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CM's article (Care and maintenance, April 8), concerning the rolling of articulated vehicles on roundabouts rightly stresses excessive speed as a contributory factor.
What does not seem to be generally appreciated is that an artic is a composite vehicle and on any sort of curve the tractor and trailer are moving in different directions.
A rigid vehicle negotiating a curve is subject to one major destabilising force only, acting through the centre of gravity.
An artic experiences two such forces. The inevitable resultant (which is greater than either) does not act through the centre of gravity of either the trailer or the tractor, with all that this implies in terms of overall stability.
D. J. WARREN Lewes, Sussex
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