Probably not what the designers intended, aesthetically speaking. But here's a cheap, easy way to keep kicked-up debris from flying into the grill of your delivery truck. Or heck, maybe they're trying to reduce airflow.
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The way I understand it, truckers do that to restrict airflow in winter; diesels run cooler than petrol engines and the cold air at highway speeds in the winter cools the engine off too much. Ha, that's what my dad told me when I was a kid anyway ;)
It's fairly common in winter in the midwest to see semi tractors with these partial vinyl covers secured with metal snaps around the radiator opening.
My dad used to do it during especially cold weather so that there would be enough engine heat to run the cab heater.
It's likely a carry over from earlier generations of vehicle designs. I'm am almost positive today's manufacturers design their vehicles to operate properly in all conditions. Blocking the airflow is probably causing some small amount of inefficiencies on modern diesel vehicles. I also saw this with every diesel truck in the farming area I grew up. I just thought it helped keep the engine and cab warmer.