Assertion: friction's value | /r/UsedFor | refer to tyre
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Source sentences:
text: The principle should be that guidelines should always specify the conditions for the values of which they refer to (for example do the values refer to tyres in good condition on wet road surfaces, are they based on observed values , what is the source and date of these observed values, do they quoted figures include for a factor of safety – and if they do include a FOS, what is it?)