I am working on a project with my local parish council and have been asked a strange question!
Is there any way to have a sat nav signal blocked or rerouted? I know it is a big ask and I am waiting for a phone call from Obama 
It seems that some satnavs are diverting heavy traffic through the narrowest part of the village when there is a shorter more suitable route. We have looked at using the blue satellite signs that they have got, to prevent some vehicles blocking my hood 
I donât know of any way to block the signal and Iâm not even sure if it would be legal if you can.
As you probably know the signal for sat-navs comes from various satellites which tells the sat-nav software your current location, itâs the software that uses the map on the sat-nav to choose the route, so even if you could block the GPS signal youâd probably just end up with people driving round the village looking for the way out with no working sat-nav to aid them.
Probably the best way to deal with the problem would be to contact the various sat-nav manufacturers and ask them if they can do anything about the routing.
Your council could also apply to have LGV diversion signs put up and signs to direct the heavy traffic the way they want it to go.
tachograph:
I donât know of any way to block the signal and Iâm not even sure if it would be legal if you can.As you probably know the signal for sat-navs comes from various satellites which tells the sat-nav software your current location, itâs the software that uses the map on the sat-nav to choose the route, so even if you could block the GPS signal youâd probably just end up with people driving round the village looking for the way out with no working sat-nav to aid them.
Probably the best way to deal with the problem would be to contact the various sat-nav manufacturers and ask them if they can do anything about the routing.
Your council could also apply to have LGV diversion signs put up and signs to direct the heavy traffic the way they want it to go.
The signs are already in hand, but the question was asked and I initially laughed, then told them I would put it out to the massive 
I have since done a test drive between 2 local points and it is the car sat nav that is causing the problem, not the road signs. It is 300 metres shorter through the village.
Thanks for the suggestions.
you cannot block a signal, but you can get routes blocked, however that would be to all vehicles here is an example in Canterbury you will notice it will not route through Giles lane, speak to tom tom about why you canât route through there and then ask them how Canterbury Council managed to block the road on the map so you can do the same in your village 
jimti:
you cannot block a signal, but you can get routes blocked, however that would be to all vehicles here is an example. you will notice it will not route through Giles lane, speak to tom tom about why you canât route through there and then ask them how Canterbury Council managed to block the road on the map so you can do the same in your village
Very interesting, is Giles Lane part of the university though? I notice that the road signs are all blue like a motorway 
Ironically Giles lane is the only public road that runs through the University yet is the only road that has the restriction, all the roads with the ânot a public right of wayâ sign can be routed along without any problems.
I am not sure if the same applies to other satnav systems, it could be that the data comes from the data supplier (teleatlas?) but didnât think to ask tom tom when I spoke to them.
Just as another point there are roadworks on Giles lane at the moment from Newark st heading west for about 100m and the road is closed, if you approach Giles lane from the East the diversion is signed the same way as the tom tom directs you rather than Giles lane then University road onto the A290. 