Developing and emerging countries have an advantage over the USA in the underpass minimum height area. Since most of their infrastructure is based on modern vehicle sizes and carrying capacities when they construct their roads the roads are built to a higher set of weight standards than the USA has they are built to have a use life of 100 years and are regularly re topped to insure they remain smooth the bridges are a minimum of 5 meter with 5.5 being the normal minimum a new overpass will be constructed this allows for years of re topping without the need to grind away the surface prior to adding a new layer but normally many countries will only allow 2 layers put down before grinding back down to the concrete
In Israel for instance the highway that runs the length of the country is capable of being used as a runway for aircraft of almost any size almost anywhere along its length this was done because of the threat of losing their established airports. In the oil rich countries on the Saudi Arabian peninsula their roads are made to withstand 2, 3 even 4 times the maximum axle weights allowed here in the USA