Road and rail chiefs were today on high alert, with fleets of grit and de-icing trucks to avoid a repeat of the travel chaos caused by heavy snowfall in February. Transport for London insisted it was better prepared than at the beginning of the year, when six inches of snow halted all London's 8,000 buses for the first time and all but two Tube lines were suspended. A spokesman said today: "We are in contact with the Met Office and are closely monitoring forecasts."