About 4.5 meters. Jinan, also known as Quancheng, is a prefecture-level city, provincial capital city, sub-provincial city, mega-city and core city of Jinan metropolitan area under the jurisdiction of Shandong Province, and is the central city of the southern wing of Bohai Rim approved by the State Council. The width of the ultra-wide lane of toll station is generally about 4.5 meters. In order to ensure the stability of the guardrail machine, the length of the ultra-wide lane guardrail machine is generally about 3.8 meters, and there is a certain distance between the ultra-wide lane guardrail machine and the side guardrail. Water horses and reflective cones are placed beside the guardrail machine.