Dr. Declan Bedford:

Yes, and the legislation has come in now, so it is going to be very interesting to see how many people are caught. It is a bit early yet to see what the trend is and how many people get caught and how much safer the roads get when people understand that they are going to be caught. However, we know from the population studies that a fair number of people are taking drugs. There are many people taking cannabis, benzodiazepines and other drugs. They do impair driving, and at a population level that means there will be more crashes.

If the legislation is implemented in a visible manner people might take account of it and decide not to take drugs and drive.