Topic: What's special about this car #4 - A third stoplight, 50 years in advance

[Ray B.]

A new kind of puzzle to keep you busy for the weekend.

Name the car if you like, but it won't get you any point. Telling us what is special about it, and what it is used for will get  you one.

If you're new around here, remember that you have to register before you can post your answer.

[Paul Jaray]

What's special about this car #4

It's only an half?

[Otto Puzzell]

 

[Ray B.]

Experts?

[ImpishGrin]

Does it have a glowing antenna?

[Ray B.]

That's a fact. But this isn't enough.

[K5ING]

That's a stoplight mounted atop the radio antenna for high visibility, and wired in with the existing stoplights. 

[Ray B.]

A device that became mandatory more than 50 years later.

Now that's what I call futuristic!

Well done.

[K5ING]

Thanks. 

I don't think anything is ever invented....they're just rediscovered.   For example, look at the article that shares the same page as your source for this puzzle, plus the following page.