For two days I have been seeing a 'T-bone type crash' involving cars.

I found this curious and decided that perhaps it was a warning of some sort. The sensation was so strong in fact, that I actually began looking both way before crossing through a green light.

I was ruminating on it on the drive home last night, trying to figure out where it was coming from. As the crash like you mention is distinctly perpendicular.

Then, in the early hours, I dreamed of a freight train wreck. One train plowed into another perpendicularly.