The Highway Code is joining the digital age by launching it as an interactive app for smartphones, making it easier for road users to keep up to date with the rules of the road.

Much of the Highway Code's content has changed considerably since its launch in 1931. For example mirrors were not even mentioned in the first edition and drivers were advised to sound their horn when overtaking.

How road users access its content has also moved with the times. It is already free to read online, can be downloaded as an e-book and there are also Facebook and Twitter accounts offering regular topical reminders.

Now a new app for the iPhone, iPad or iPod Touch will make it even easier to keep up to date with the rules of the road through a more intuitive, interactive format.

Transport secretary Justine Greening said: "With more and more of us using smartphones and other devices it's vital that products like the Highway Code adapt to be as accessible as possible.

"The app makes it easier for everyone to keep their knowledge up to date and is a great example of how new technology can help to improve road safety.

"The Highway Code has been helping to save lives for more than 80 years and, with innovations like this, I am confident it will do so for many more to come."

The new app includes the complete contents of the Highway Code with a search facility making it easy to find rules and information. There are also interactive features like quizzes, a stopping distance calculator and a tool to help users identify road signs.

The Official Highway Code app is available on iTunes for £3.99. For other official Highway Code publications see tsoshop.co.uk/bookstore.asp?FO=1207776.

The Highway Code is free to view online at direct.gov.uk/highwaycode.