Seatbelt and mobile phone use surveys

T he Department for Transport has commissioned regular surveysfor the use of using the mobile phone and the main results are:

Since the last survey in September 2008 the proportion of drivers observed using hand-held mobile phones whilst driving increased (from 1.1 per cent to 1.4 per cent for car drivers and from 2.2 per cent to 2.6 per cent for van and lorry drivers). 
An increase in the number of drivers who appear to be using hands free mobile phones (from 0.5 per cent to 1.4 per cent for car drivers and from 1.1 per cent to 2.4 per cent for van and lorry drivers) was observed in the same period.

Surveys to monitor mobile phone use by drivers have been carried out since 2002.  Each year the survey is carried out at 30 sites in the South East of England.  Surveys take place throughout daylight hours and involve observers recording mobile phone use by drivers in free-flowing traffic, aided by a mobile phone detector. 

So where does it all go wrong? When you learn to drive,safety, including guidance on wearing seatbelts and using a mobile phone is taught from the first lesson, so why does it change? what are your thoughts?