Passage 2
If there is a road to China’s future, Highway 204 out of Shanghai is it. Along its two dusty lanes, local trucks and buses jockey with Cadillacs driven by financiers from Taiwan and Hong Kong investors. Migrant workers crowd the narrow shoulders. Factories line the highway, producing sneakers, toys, plastics, clothes, aircraft components and medical equipment. Eventually industry gives way to ricefields, which is being dug up to build still more factories. Cranes turn overhead as dump trucks and cement mixers nose onto the road. Outside the town of Jiading, one tractor-trailer leaves Asia’s largest container plant every three minutes, carrying goods bound for the Shanghai docks. The traffic on Highway 204 is so thick that the trip from Shanghai to Zhangjiagang- only 115 kilometers away- takes five hours.
49.What’s the exact meaning of “ lanes ” here in the sentence?