"Routes to popular holiday destinations in the Coromandel and Bay of Plenty are particularly affected as these are also routes transited by heavy transport vehicles servicing the ports of Tauranga and Auckland," she said.
"It's not just crashes making life difficult, as this incident was going on reports came in of two trucks breaking down on SH29, one on the Matamata side and one near the summit of the Kaimai Range.
"If that wasn't bad enough a car hit a fence in the wet about 9.30am on SH27 near Kaihere while another car crashed on the same road about 1.30pm.
Mrs Grace said the cause of the various crashes is yet to be determined but she feared drivers not adjusting to the conditions and inattention could have played a part.
"Speed and not driving to the conditions seems to be a common theme today."
Mrs Grace said with further bad weather forecast the Police's message is a simple one.
"If you don't need to go now, don't. Wait till it fines up and if you absolutely have to drive, make sure you drive to the conditions and as they've changed, so should your speed."