You dont need any of these speed detector things just get your boss to paint your truck with this then you can do 100mph all day long without being nobbled by your colleagues or the law 
Simon
I have a sat nav system,and download for FREE,the speedcamera database,which is updated monthly,which will alert me to the location only,of ALL types of cash machines used by the filth,errr… Police constabules.
So I get 2 systems for the price of 1.
Also came in handy on my recent joliday to France.
Ken.
The satnav systems can also be used to find other points of interest as well as Speed camera sites, such as Filling stations etc