Consider the following statements about road transport:

1. Road transport offers door-to-door service, making it a highly flexible mode of transportation.
2. Roads can be built in terrains where rail or air transport may not be feasible, such as hilly areas or dense forests.
3. The construction and maintenance of roads are more cost-effective than railways and airports.
4. All countries have the same quality of roadways, regardless of their economic status or geography.