BEIJING, Jan 22 (Reuters) - The number of new vehicles registered in Beijing hit a new record in the first 18 days of 2007, Xinhua news agency said on Monday, as the city struggles to cope with worsening traffic jams ahead of the 2008 Olympics. More than 22,000 vehicles -- which under China's statistics system includes everything from private cars to trucks -- were registered and an estimated three million will be on the roads by May, the official news agency said.