What is the height of the high-speed free height limiting pole?

The height of the high-speed free height limiting rod is as follows:

According to China's inquiry. Com, the height limit pole of the city is 4.5 meters, the height limit of tractor passage is 2.7 meters, the height limit of automobile passage is 3.5 meters, and the height limit of passing fire trucks is 4. 1 meter. The Technical Standard for Highway Engineering stipulates that a highway should adopt the same clear height. The clear height of expressway, first-class highway and second-class highway should be 5.00 m; The clear height of Grade III and IV highways shall be 4.50m. ..