Although the rule was first given its approval in March 2019 it has now been given its final acceptance by the European Council. In-car breathalyser technology is proven and a number of systems are already on the market.
The rules will also call for intelligent speed assistance (ISA) systems to be fitted. These have also been trialled and utilise proven technology. Using a combination of GPS location data and information from ground loops, the ISA technology is intended to prevent drivers from speeding.
However, there are many sceptics who believe the ISA technology will be less effective at reducing the incidence of crashes than claimed.
There is evidence that driver assistance systems have little or no benefit to road safety. There is also concern that driver distraction (and smartphone use at the wheel in particular) provides a growing risk of crashes, something these new rules overlook.