evidence: So onto the actual trail. The trailhead for the Doi Langka hike is at a radar station/phone tower, coordinates 19.051933, 99.381713. The bottom of this road has a barrier across it but motorcycles can just drive around the barrier. If you had a car the barrier is not locked so you could lift it up and drive through. In my experience the radar station at the top is not manned and I think it unlikely you would encounter anybody on the road or at the top. If you did not drive through the barrier you would be faced with a 3km uphill walk just to get to the trailhead. Of course if doing this trek with a NP guide they would drive you to the start. Since I was arriving by motorbike and not using guides I needed to get back to my bike, so I turned around at Doi Langka Noi, camped at Doi Langka and finished where I started. Total distance over 2 days about 30km. In doing this I had the benefit or losing a lot of gear weight once I reached Doi Langka as I could set up camp there and return to it later. With just essentials on my back progress was fast to Langka Noi and back. Here is my GPS route trace (one way only, the return journey). The white line is Doi Langka Noi to Doi Langka Luang and the blue line is campsite at Doi Langka Luang back to trailhead.