Outdoor advertising price in expressway

Which expressway do you want to do, double-sided or three-sided? The price varies greatly. Take both sides as an example, the expressway of Capital Airport can reach more than 4 million/year, Pudong Airport is close to the airport terminal, and the road is 1 0,000-10.8 million. For example, Shanghai-Nanjing Expressway, one of the best expressway in China, has the most expensive section of over 600,000 yuan (over 300,000 yuan) and the cheapest section of Zhenjiang. So, please add a question and ask clearly which section of expressway is needed. In addition, the specifications of billboards are generally 6m * 18m *2 or 6m * 18m *3.