What can be more distracting than a car with a large pole sticking up with cameras on top. I noticed the other week when in N Yorkshire the amount of people being distracted from their norm by the Google car passing by.
I've not actually seen one of these smart cars with the cameras fitted, but if they're anything like this. click here
The Police can actually park on the pavement if carrying out police duties. There was a case near me last year where a police speed camera van was parked on the pavement.
They caught about 60 speeding motorists in a day, but every ticket had to be cancelled, firstly because they were half way down a quite steep hill, where you'd have a hell of a job to keep below 30, secondly, because the camera van was actually blocking the "warning speed cameras" sign. Idiots...