Guess?

This is ?

Clues....

1. I was out on a long run on a semi closed road.

2. It was a bit too dark for running on a country road and I was very cautious when cars were about.

3. It was the longest run I've ever done (1hr 18mins) and I'm glad this was this colour when I approached. I didn't need to stop.

Any guesses?

I will be most impressed if you get it.

Thanks for looking.
B