宇部興産専用道路の「伊佐トンネル入口」を走るダブルストレーラーの日常 / A doubles trailer on the Ube Industries' exclusive road

I took this picture of a doubles trailer running through the entrance of the Isa Tunnel, the only tunnel on the Ube Industries Exclusive Road. This will be the highest elevation, and this is where the doubles trailer coming up from the Isa Cement Factory will shift gears and accelerate as the slope slows. I didn't use the GoPro sound, but used a directional PCM recorder to record the driving sound separately, so I think there is less noise such as wind noise. The vehicles coming from the Ube Cement Factory are less loaded and have a quieter engine sound as they go downhill, but listen to the engine and running sound of the doubles trailer coming out of the Isa Cement Factory coming out of the tunnel. I put in not only doubles trailers, but also Scania high-floor four-axle dumps and dump trailers from Hino and Isuzu without cutting them. There's a 5-minute timelapse along the way, uncut, to see the daily life of the various vehicles in about 25 minutes of actual time. Please note that this is a fixed point shooting, so there is no zoom.