This week's programme in the series on Man and Science Today.
Which causes most accidents:
I: The Car? II: The Road? III: The Driver?

When the question is put in this form most people suspect - correctly - that the scientist is about to tell them that people themselves are the weakest link in the road system. If, as we are told, the driver is wholly or partly responsible for 85 per cent of accidents, are we spending too much on road and car improvement and not enough on trying to change driving behaviour? Or is the only answer the "airbag" - a cushion which inflates automatically in a collision and which is to be fitted to all new cars sold in America after 1 July 1973?
Tonight's report on car safety shows research where the cost of every measure proposed must be coldly set against the calculated cost of the lives it could save, and where the first aim must be to reduce the severity of the accidents which cause 100,000 deaths and serious injuries in Britain every year to the level of what Dr Murray MacKay of Birmingham University's Road Accident Research Unit calls "a pretty nice sort of accident to have" - one in which the car itself may be a write-off but the driver's life and future health are preserved.