Mobile Billboards: Bringing More Air Pollution, Traffic Congestion, Parking Problems

I love Ban Billboard Blight for their continued coverage of LA based outdoor advertising issues. In their most recent post on mobile billboards they pose this question...

So how should we regard the rapidly-growing phenomenon of mobile billboards mounted on trucks and trailers and driven through the streets or left sitting for days in highly sought-after parking spaces? As inevitable manifestations of commercial enterprise, or as destructive, anti-social assaults on our shared public spaces that ought to banned forthwith?

The San Francisco ordinance banning mobile advertising is explained like this...

By their nature, commercial advertising vehicles are intended to distract, and aim to capture and hold the attention of, members of the public on or adjoining public streets, including drivers, pedestrians, bicyclists, and others. Moreover, such vehicles display commercial advertising from a mobile platform, including while the vehicle is moving within the flow of traffic, potentially stopping, starting, or turning abruptly, accentuating the inherent tendency of such advertising to seize attention and to distract. Additionally, the use of motor vehicles to display commercial advertising creates exhaust emissions. For these reasons, the Board of Supervisors finds that commercial advertising vehicles create aesthetic blight and visual clutter and create potential and actual traffic and health and safety hazards.