Yeah, I did think of that. At least the 6-F's were unjammable and very hard to detect (would be easier now with a segged V1C or Redline BS/RDR vertically mounted).

From Delonix's website ;

The Multanova 6F speed camera was the main type of speed camera used in Western Australia up until the end of 2009. Now 30 Vitronics (Poliscan) laser based speed cameras (see below) are replacing the 27 Multanova speed cameras throughout WA.