[BLSTIC]

The lack of smoothness creates a lot of turbulence, which is generally higher pressure, but the particular phenomenon you witnessed was a result of the wheels, they (combined with the wheel wells) create a not-inconsiderable low pressure zone behind them and a small but intense high pressure zone in front of them. The end result is that the wheel would suck anything on the underside of the car towards this, but because inertia, the newspaper came out behind the wheel and was attracted to the *somewhat* more attached and lower pressure on the side of the car