Whilst 'blasting' through Italy
on my recent jaunt, my mate on his blacky had a detector and jammer which went off for no apparent reason
while we 'were making progress'
down a nice long sweeping section of sunny Italian tarmac, luckily he gave us all the 'errr slow down just in case...' sign,
which we did and low and behold, there was Italian plod with his nice new laser speed detector device, (now showing an 'error' message one presumes
). So, imho, they are extreamly usefull when you are out of town, once into the city, turn em off.