The Road Safety Authority has launched a campaign to make people aware of the dangers of driving, stopping and walking on motorways.

Almost 100 people have been killed or seriously injured on Irish motorways in the past five years as the Irish motorway network has grown.

Between 2009 and 2010 the number of car users seriously injured on motorways trebled.

Last year, 20% of those killed on motorways were pedestrians.

The National Roads Authority says that on a new stretch of road in Limerick, around 30 motorists a month are driving the wrong way down the motorway.

In the first three months of this year, gardaí issued 69 people with penalty points for this kind of offence.

Almost 700 people have been given points for driving on the hard shoulder.

Last year, the AA also saw a 60% increase in the number of members who broke down on motorways.

A new 40-second advertisement to promote the dangers of motorways will begin appearing on television today and warns people never to stop or walk on a motorway.

The RSA has also appealed to people to take better care when driving on these roads, particularly in poor conditions.