[az_gila]

No, it’s some sort of sensor.

Probably a ground radar for sighting vehicles and they are using traffic to practice

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I would guess it's simply a precision guided shell, similar to the existing Excalibur program -

http://en.wikipedia.org/wiki/M982_Excalibur

Could it be testing automatic target recognition using the passing cars?

[Jewbacca]

Maybe. I’d have to see what else it out there -— e.g., an active radar or microwave source.

I’d also want to know which way was “front” — nose or side.

It just looks an awful lot like things I’ve seen on ground vehicles used to target tanks and the like.