Talk:Road signs in Thailand

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Vienna Convention Type B

Some of the diagrams used in the article are actually of signs used in other countries -- especially Japan -- and while correct enough in overall design are, of course, frequently different in detail. One serious discrepancy is that mandatory directional signs in Thailand are of Vienna Convention Type B (and not Type A as in Japan): I've changed the Keep Left sign shown here accordingly. -- Picapica (talk) 12:19, 19 April 2013 (UTC)[reply]

Compulsory left turn

I regularly see the confusing sign "compulsory left turn" with white background, red rim and a curved left arrow, but no diagonal red bar. See a (non-free) picture here. −Woodstone (talk) 18:25, 25 January 2017 (UTC)[reply]

That's a non-standard sign. Correct compulsory left turn signs have a white arrow on a blue background, although it seems even some police departments aren't aware of this. --Paul_012 (talk) 11:24, 26 January 2017 (UTC)[reply]
I know that's the international standard, but I don't remember ever having seen the blue one in Thailand. They always use the white/red one (without diagonal). −Woodstone (talk) 18:26, 26 January 2017 (UTC)[reply]
They are used. See for example the signage at Phloen Chit Intersection.[1] --Paul_012 (talk) 21:08, 26 January 2017 (UTC)[reply]
Indeed and thanks. Funnily enough a hundred meters further, at the entrance to the highway, they show the more usual model.
It leaves the question of whether we should include the red/white model in the list of signs on the page. It is quite common. −Woodstone (talk) 07:58, 27 January 2017 (UTC)[reply]
From what I observe, it seems like the more permanent signs tend to follow the standard, while ad-hoc ones often don't. At any rate, we need a reliable source discussing the fact. The law clearly states that the white on blue is the correct one.[2] (Though I note that the article currently includes a jumble of signs seemingly both specified by the law and not. Much clean-up appears needed.) --Paul_012 (talk) 13:59, 27 January 2017 (UTC)[reply
]
In my view the article should not be based only on the law, but also include common practise in the country. We should describe reality, not the formal state. −Woodstone (talk) 08:03, 28 January 2017 (UTC)[reply]
Of course. I have nothing against that; just pointing out that it'd be more difficult to find reliable sources that document such practices. --Paul_012 (talk) 05:03, 29 January 2017 (UTC)[reply]

This seems a valid reference: [3]. −Woodstone (talk) 17:12, 29 January 2017 (UTC)[reply]

Late reply (5 years later): The red-rim round sign was indeed previously correct. The oldest official document I found was a Proclamation of the Traffic Officer dated 31 March 1958.[4] The blue sign was officially made the standard in 2004.[5] --Paul_012 (talk) 07:29, 2 September 2022 (UTC)[reply]

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Right-of-way at uncontrolled junctions?

Which right-of-way rule applies at an uncontrolled junction in Thailand? Some people claim that it is priority to the left (which obliges a vehicle driver to give way for every vehicle oncoming from the left - just as a driver must do for vehicles oncoming from the right in most European countries where priority to the right applies). 90.231.234.93 (talk) 12:05, 1 September 2022 (UTC)[reply]

That is correct, according to Section 71(1) of the Road Traffic Act, B.E. 2522. Not sure if most motorists actually know this, though. --Paul_012 (talk) 07:07, 2 September 2022 (UTC)[reply]
It seems that vehicle drivers often miss their duty to yield priority for a vehicle oncoming from a road on the left-hand side, mainly at three-way junctions and intersections between a big road and a smaller road. Drivers seem to have tendency to perceive that the bigger road, or the road going straight ahead at a t-junction, is a "priority road".
I personally think it is very unrealistic to have priority to the left/priority to the right at a three-way junction, obliging a vehicle driver to yield for a vehicle oncoming from a sideroad to the left/right.
In some countries, mainly UK and Australia, it's always the T-junction rule applying at a three-way junction, obliging a vehicle driver turning in a t-junction to yield for every vehicle approaching the junction (on the way straight ahead) and, if the driver turns right (in left-hand traffic), for vehicles turning left or (if two drivers both turn right) for the vehicle approaching from the left (and the road going straight ahead at a t-junction is normally also marked as "priority road"). Why doesn't the T-junction rule apply in for example mainland-Europe if it applies in Britain? 90.231.234.93 (talk) 20:31, 2 September 2022 (UTC)[reply]
According to Thai law, the priority-to-the-left rule only applies when neither intersecting road is designated as having right-of-way. at T-junctions and intersections between bigger and smaller roads, the ways you describe are usually designated (most often by road markings) as such. --Paul_012 (talk) 08:41, 5 September 2022 (UTC)[reply]
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