you might want to google a place called mira just outside of nuneaton. they do vehicle testing for teh major 5. however you wont get anywhere near vehicle testing nowadays thanks to software like nx4.
the first bar honda was designed using it, without the aid of a wind tunnel.
look how good it was.
That means f all, theres still butloads of field testing. Software is irrelevent.
I worked in test automation for one of my employers, attempting to cut down the amount of test driving necessary. HiL is what will take over, not software.