Volvo has famously said that, by 2020, no one should be killed or seriously injured in one of its new cars. Jeremy Clarkson has an alternative approach to road safety – to replace air bags with titanium spikes, which, in the event of a crash, will impale the driver to the seat, thus encouraging people to drive more carefully. There is a great divide in the road safety world in the 21st century, with Jeremy Clarkson (and most…