Non F1 but interesting thing I saw on road today.

[Hobbs04]

F1 is relevant to road cars. I saw this aero bit on a semi on CA freeway. Thought I would share.
http://www.atdynamics.com/trailertail.htm

[Red Schneider]

I've been waiting to see this forever. You don't have to be an aerodynamicist to figure out that it could be cost-effective to smoothen the airflow with something like that, especially for people who do highway driving for a living. (As long as it's light enough and cheap enough...)

I'm guessing the volume right behind the trailer is a low-pressure zone that pulls the truck backwards, but I don't know for sure.

[Jersey Tom]

Aerodynamics are relevant to road cars

Yes, quite.

[Slife]

But who is to say that even if F1 did not exsist, that some mechanical engineer would have probably developped something similar to the thing on the truck ??

[Hobbs04]

Read the FAQ section has a neat CFD showing before and after.