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I was looking at the national highway (non-motorway) network of Thailand. It seems that most 1/2 digit highways have been widened to four lane roads. These are mostly at-grade roads with lots of rural development and access along them, but they are still four lane roads, most of those on a relatively straight alignment in flat terrain. I wonder what kind of travel times you can get on them. Most of them seem to have been widened in recent years.

Even roads like Highway 12, 23 or 24 are (almost) entirely widened to 4 lanes. These are not on the core route network.

Thai road planning must be somewhat difficult due to the lack of major cities outside of the Bangkok region. In most countries you would prioritize routes between major cities, but Thailand has no major cities outside of Bangkok. The rural areas are densely settled, but they lack major population centers. Most provincial capitals are small, Thailand has a population of 69 million but only has 12 cities with a population over 100,000 with half of those being in the Bangkok metropolitan area.
 

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It’s not difficult, mainly because those foreign websites mistakenly only refer to Thai provincial capital population, which is not the whole picture.

In Thailand we count population by “amphoe“, which is like district or counties. Take Chiang Mai as an example, it is said that the population of Chiang Mai city is 233,632 (2019), but this is only the innermost city provincial capital district. Chiang Mai Urban sprawl comprises of several other districts, and its urban/metro population is over 1 million or more than half of the total population of Chiang Mai province of 1,76 million.

Bangkok, being a self governed district gets to count all of its district population as one. It has also fully absorbed 3 nearby provinces in its metro area and 2 more in the near future.

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Another example is the urbanized eastern coast of Thailand. We call this EEC (Eastern Economic Area), which is comprised of 3 provinces.
Foreigners might only know of Pattaya (the third bright spot towards the south), which is said to have a population of only 119,532 (2019), but it is only an “amphoe” or a district of Chonburi province. The metro population of Chonburi is about 1,4 million, while the whole EEC area has a population of 2,9 million.

These are some of the districts of Chonburi Province.

Pattaya, a self governed district of Chonburi. The 4th picture (mainly the northern part) is actually not counted as within Pattaya.
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Si Racha, you might have heard the name from Si Racha hot chili sauce.
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Bang Saen, a popular beach town for Thais. The district can be seen in the background.
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Chonburi, the provincial capital. Dwarfed in popularity by the province’s other districts.
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Detective
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I was looking at the national highway (non-motorway) network of Thailand. It seems that most 1/2 digit highways have been widened to four lane roads. These are mostly at-grade roads with lots of rural development and access along them, but they are still four lane roads, most of those on a relatively straight alignment in flat terrain. I wonder what kind of travel times you can get on them. Most of them seem to have been widened in recent years.

Even roads like Highway 12, 23 or 24 are (almost) entirely widened to 4 lanes. These are not on the core route network.
All main highways will be expanded to 4 lanes within 2 years or in 2022.
Currently we’re in Phase 2, consisting of 11 networks, with a total distance of 5,246 km, divided into 4,239 km that are already completed or 80% of the plan and 483 km is under contruction or 9.2%, The remaining plans for the future is for the 524 km remaining or 10% of the networks.
 

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Detective
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I've taken a look at the last picture on Google Maps. What's the purpose of this causeway? Is it meant to be some kind of ringroad, or is it part of a land reclamation project?
It’s meant to be a bypass, to avoid the gridlocks of the main roads of the city, but it has since become a popular hangout spot and viewpoint area.

 

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Rama III-Dao Khanong expressway 19.2 km.










 

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Motorway 82 . Length 81 km.









 
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