Police are advising motorists to take extra care on the roads in Central Hawke's Bay as heavy rain is causing surface flooding.

Two of the worst affected areas are the Takapau township and State Highway 50 near Paget Rd.

Police ask that drivers in the area slow down, increase their following distances and drive to the conditions.

Heavy rain saw changes being made to Horse of the Year, being held at the Hawke's Bay Showgrounds, including the cancellation of the cross country event yesterday.

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The rain cleared this morning, but returned this afternoon.