Well done to locutus for noticing that the lights in this shot are from oncoming traffic.
My original idea was to capture both lanes of traffic - getting both red and white light trails. I actually spent hours waiting for exactly that situation (it was late - traffic had died down).
But then when I was busy with pp, I liked the crop that only had the white lights - the lines seemed much cleaner and simpler, and the whole "turn left" concept seemed enhanced by it.
Here is what the uncropped original photo looked like:
And I think I agree with the comments about rotating it. I just liked the shape of the light curve so much, that I didn't really concentrate on the angle of the signpost.
A nice juxtaposition of the headlight trails with the "bear left" chevrons.
I think the image could be improved by straightening it, so that the chevrons are properly horizontal. And the exposure of the chevrons is too grainy, and the chevrons themselves too dilapidated, for this to be a really great shot. But take the concept to somewhere where you have some less scruffy roadsigns and a better opportunity to expose the shot well, and you'll have something good.
Finally, I can't help but notice that these look like headlight trails, not tail-light trails. Which of course means that the vehicle would've been turning right! :-)