Bitumen technology is benefiting from years of research and development - Kristina Smith. On a 2.7km loop of road in Auburn in Alabama, US, a lorry driver drives his triple-truck round and round. During his eight-hour shift, he will have covered 544km, with another driver waiting to take over from him for the next shift. Their mission is to seriously damage the road. This is the National Center for Asphalt Technology (NCAT), where sponsors from states and private companies pay to test out new materials and
