<p><br /> A jam along China's Beijing-Tibet highway has grown to more than 75-miles long as the tail back of cars extended into its third day.<br /> </p><p><br /> The jam started near the Chinese capital on Tuesday, as traffic restrictions in Hebei province caused tailbacks along the highway.<br /> </p><p><br /> Traffic build-ups have become a common occurrence on the country's roads - just over one week ago the authorities finally managed to clear a 62-mile jam from the same road which had lasted for nine days.<br /> </p><p><br /> Most of the 10,000 vehicles in the hold up are coal lorries and they are also blocking feeder roads leading onto the highway.<br /> </p><p><br /> China is the world's top producer and user of coal, which has fuelled its rapid economic growth over the past three decades, and the area has large reserves.<br /> </p><p><br /> While China is spending billions of dollars on infrastructure such as roads and railways, it is still struggling to keep up with the demands of its booming economy.<br /> </p>
