Weather warnings have been put in place across Hampshire, Surrey, West Sussex, East Sussex and Kent this morning.
Dense fog is covering most of the region.
The Sheppey Crossing in Kent is particularly bad, but remains open at the moment.
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A rail company is rolling out defibrillators at its stations across Sussex in a bid to save lives.
In some cases, victims of violence and other serious crimes face long delays as forces are unable to dispatch officers promptly.
Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."