Won’t it make driving harder?

This will be a change and it will take some conscious decision making as a driver to make a difference. The change can be compared to anti-drink driving campaigns and Clunk, Click, the seatbelt campaign: over time it has become unacceptable to drive while drunk and it is now second nature to put a seatbelt on to drive. It will take some time to become second nature.

In reality we are rarely driving at a consistent speed, particularly in a city where we are constantly accelerating, decelerating and braking to respond to current traffic speeds, traffic lights or junctions.