个人认为,解决这些问题貌似需要重装NAM
1、检查并确认Additional Features and Customization - Road Textures and Markings - Asphalt Textures for Maxis Highway 没有选中
2、检查并确认Additional Features and Customization - Road Textures and Markings - Cul-de-Sacs 没有选中
3、这个不太清楚……貌似NAM v31.2只能把单行道的箭头指示去掉或者减半显示
4、检查并确认Additional Features and Customization - Turning Lanes 下选中所需要的转弯车道类型。