The employees tour the Detroit auto show on industry day

The North American International Auto Show is the place to show off the latest and greatest car tech - but it's also a prime time to spy on your competition.

While most customers look at an engine next week, the industry preview - where people are pointing, photographing and even getting under the engine - is where workers themselves check out the other guys.

These are the men and women who make the fuel rail on the engine, the sunvisor, the specifically designed tires, the lights - and so much more.

Check it out as Charlie Langton took a tour with the industry workers in the video above.