Number one main highway is a highway between the cities, the main link between Bangkok to each region of the country. There are a total of 5 lines from No. 5 to no. 8 and no. 9, which is a ring road, ropnokkrungthep Bangkok.Highway number two official link from Highway between the main line links to high-traffic routes and paths into key areas in a particular sector. The guidelines are organized into a highway number system is a 2-digit numbers by criteria to define is the first digit is the number of main line, and the second digit is a number sequence, the line splits from the main line thereof.
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