What do such stop, caution, and go symbols tell consumers?

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Heidfeld led as the safety car pulled off, ahead of eight other cars which did not stop during the caution period, and Kubica in 10th place.

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In fact, some experts caution patients that, over time, certain medications may stop working effectively and may actually cause rebound -- or overuse -- headaches.

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He said research in Britain, Australia and the US suggested that a warning or a caution from a police officer tended to stop stalking but only "if it happens before the obsessive behaviour becomes ingrained".

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The overall view is that it is not "wise" to get into specifics around individuals, and that "particular caution" should be exercised, but that the chair has no power to stop references by MPs to injuncted matters which are not before the courts.

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