Well, you can't watch the video below any more, as it has become "private" for some reason on Youtube. It was public. I have seen it at a members-only site.
The video was posted on this Japanese site on July 15, and it is supposed to be the radiation level measured on July 13 on a small truck parked in Iwaki City in Fukushima Prefecture, near Onahama.
Someone is holding the personal survey meter, standing, facing the street. The survey meter shows between 0.17 to 0.45 or so microsievert/hour. The person approaches a small white truck parked on a small parking lot at the side of the road. The survey meter quickly rises above 1 microsievert/hour, then 10, and 20 microsieverts/hour.
The highest level of radiation is measured on the truck bed. As the person slowly lowers the survey meter to the floor of the bed, it goes from several tens of microsieverts/hour to 100 microsieverts/hour, then rapidly rises to 150, 380, and before it reaches the bottom the meter goes overscale and shows just "8888".
The person also measures the front right tire, which measures 17 microsieverts/hour. Inside the truck, the radiation is also very high. The survey meter goes quickly above 80 microsieverts/hour close to the seat.
As the person walks away from the truck, the radiation level quickly drops down to below 1 microsievert/hour, back to between 0.1 to 0.50 microsievert/hour.
The video you cannot see any more on Youtube. The title says "July 13, 2011 Radiation level in Onahama, Iwaki City":
(H/T Dr. Ono)