What's the difference between the western coastal expressway and the Shenhai expressway?

There is an expressway on the west coast. The coastal expressway in the west of Guangdong Province is an expressway located in the west of Guangdong Province. Because the direction of Shenhai Expressway from western Guangdong to the Pearl River Delta has been expanded to two-way eight lanes, with a speed of 120 kilometers per hour. There are only four lanes in the western coastal expressway, with many speed limits and cameras, and the traffic volume is not as large as that of Shenhai Expressway. The western coastal expressway is convenient for Zhuhai.