This refers to another problem with autonomous vehicles,
Australia plans new co-ordinates to fix sat-nav gap http://www.bbc.co.uk/news/technology-36912700
Countries, entire continents are constantly moving due to the tectonic plates of the earth constantly shifting. Australia for example as show. In the above link, moves 7cm per year. If some of these cars are relying on GPS to navigate, 7 cm can be a hell of a lot when it comes to road positioning. 7cm can be the difference in passing safely or clipping a wing mirror or worse, a corner to corner head on crash. 7cm can be the difference between driving on the road or putting a wheel off the road into the sand and causing a high speed rollover. Bear in mind that this 7cm shift is every year. After 2 years it is 14cm, after 3 years it is 21cm etc etc. The Australians are compensating for this by overcompensating which means that the GPS position on the road will not be correct until 2020 whilst they wait and hope for technology to catch up which means the GPS system will never be accurate. In my eyes, this is nowhere near good enough. Do I want to be a passenger in an autonomous vehicle which thinks it's 21 cm away from where it actually thinks it is? Hell no.