This means ice forming on roads, especially inland and in sheltered places. Black ice is a particular risk because it is transparent and difficult to spot. Those travelling late at night or early in the mornings are most likely to encounter icy conditions. Motorists are urged to reduce their speeds, increase their following distances and avoid sudden braking or turning movements on icy roads. Contractors for New Zealand Transport Agency Waka Kotahi will be out laying grit or anti-icing agents on the state highways to reduce the ice risk and help road users safe.