conventional high-speed service areas are mostly available on both sides.

that is, two-sided service areas. Service areas are set on both sides of the road, with the same service facilities and functional zoning, which can provide vehicles in their respective directions with access.

expressway service area refers to a place for passengers and drivers to rest. It should provide parking lots, toilets, gas stations, vehicle repair shops, restaurants and canteens with an average distance of about 51 kilometers. The construction scale of the service area should adapt to the future traffic growth.