Twisting Road

I am driving on a twisting, winding road in El Salvador with my sister.
The road is narrow and treacherous, plenty of people have accidentally driven off by a slight gust of wind.
We are headed over a mountain covered in lush jungle foliage and I have a birds-eye-view of the car. As I try to concentrate on the road, I take a quick glance at my sister and notice she is my mirror image.
She gasps as she remembers she has forgotten something, I wonder if we should head back...although I am unclear where back is.
Is it in front of us or behind us? It is clear that we have been here before..the end and the beginning are blurred.