A two-tier ‘alert status’ system is in place for extreme weather conditions including: flooding, fog, ice, snow and high winds. When a severe weather warning is issued by the UK Met Office and the alert status is amber, goods vehicles should be prepared for severe weather. If possible, they should choose the safest route, rather than the quickest. If the alert is red, goods vehicles should leave the road network and find a safe place to park. They must then wait until the status changes back to amber.