a network of highways

• 公路网

a network of highways的用法和样例：

例句

1. They have started building two roads linking this area with the main highway network in Sichuan.
   他们开始修建两条公路，把这个地区和四川省的主要公路网连接起来。
2. Experiments on the overall evaluation of the road network of Guangxi Zhuang Autonomous Region showed the effectiveness of the proposed method.
   对广西壮族自治区近年来公路网建设的整体性评价显示了该方法的有效性。