Whistles on Cars?

[Simon.MATTHEWS@st.com]

     Warning: LBC content = 0
     
     Humour mode ON
     
     I just read an ad. in a UK newpaper for BMW cars -- they announced 
     that their cars will now be fitted with a device that emits ultrasound 
     (between 20Khz and 45KHz) to encourage animals (such as hedgehogs) to 
     get off the road. 
     
     Quite how hedgehogs are supposed to understand the meaning of the 
     sound, or indeed, the question of whether hedgehogs actually 
     understand the concept of a road is not discussed in the ad.. 
     
     Perhaps CATS might be clever enough to understand it? Now what does 
     MOWOG stand for, or M.G.? :-)
     
     Humour mode still ON (one should never turn it off!)
         
     Simon