What is the speed limit on the slow lane of national highways?

[McEli]

National highways generally have speed limits ranging from 60 to 80. Roads that have been renovated or widened often have a limit of 80, and there are also many with a limit of 70. Older national highways with average road conditions and more curves typically have a limit of 60, and some roads may even have limits of 50 or 40. Introduction to national highways: National highways refer to major trunk roads with national political and economic significance, including important international highways, defense highways, roads connecting the capital with the provincial, autonomous region, and municipal capitals, and roads linking major economic centers, port and station hubs, commodity production bases, and strategic locations. Cross-provincial expressways within the national highway system are constructed, maintained, and managed by specialized agencies approved by the Ministry of Transport. Speed limits on national highways: Generally, the speed limits range from 60 to 80. Roads that have been renovated or widened often have a limit of 80, and there are also many with a limit of 70.