The double yellow lines and the style of the delineator posts strongly suggest North America. The foliage indicates a temperate climate, likely in autumn given the changing leaf colors. The yellow curve warning sign is standard for the United States or Canada. I suspect this is in a suburban or semi-rural wooded area in the northeastern United States. I am 30% sure of this general region.

then: forward

The road markings and the specific style of the flexible delineator posts are very characteristic of suburban roads in the Greater Toronto Area, particularly in Ontario, Canada. The yellow curve warning sign and the concrete barrier design confirm a North American setting. The dense, deciduous forest and the specific road geometry feel like a parkway or a ravine road in Toronto. I am 60% sure this is in Toronto, Ontario.

then: guess