Hello!

Hm, Oscar Brand doesn't ring a bell, but I DO know a song called "The Horse", written by Iain MacKintosh. I don't know if this is what you are looking for, but it does seem to match your description. Here it is:

The Horse

I'm driving down this motorway
No one's passed me yet
My arm on the edge of the window ledge
Makes the wind whistle like a jet
I got one finger on the steering wheel
To keep her steady on course
And I'm rolling like thunder but I sometimes wonder
Does anyone remember the horse

Then if you dozed, the reins went slack
The horse knew the way, he'd bring you back
Maybe you got there a little late
But the folks didn't mind if they had to wait
Does anyone remember the horse
Does anyone remember the horse

My foot's on the floor, she won't do any more
There's no use wasting time
Eyes fixed like a rifle sight
On that neverending centre line
My headlights are cutting through the night
And I'm moving like a natural force
And I'm rolling like thunder but I sometimes wonder
Does anyone remember the horse

Then the sun shone down from a clear blue sky
You tipped your head if a friend walked by
The horse didn't need any oil or gas
Just a drink of water and a feed of grass
Does anyone remember the horse
Does anyone remember the horse

A diesel on my tail, right behind me
In the mirror headlights blind me
He hits the button, the airhorns blast
But I'm in front, he won't get past
I won't slow down I don't know how
I won't slow down it's too late now
I curse the car the truck and the bus
They've killed the horse and they're killing us