Free-pass policy faces rush test

China's policy that exempts cars from road tolls during holidays will face an unprecedented test in the Spring Festival travel rush, the world's largest annual migration.

The country's 260 million drivers will be exempt from highway tolls as they return home to be reunited with their families.

The free-pass policy will see a 70 percent increase in traffic flow during the Spring Festival holiday from Feb 9 to Feb 15, highway authorities said.