The Meaning Behind Different Shapes On Motorway Signs
Squares, Triangles, Circles and Diamonds
Over the last number of years, you may have noticed different shapes appearing on motorway signs across Ireland. The shapes (square, diamond, circle and triangle) are placed on yellow backgrounds and can often be found at major motorway junctions.
The signs were introduced in 2016 and are designed to inform motorists of an emergency or an alternative diversion route for motorways.
The idea behind the system is to improve the flow of traffic in the event of an emergency. The system is easy to follow and there is no need for motorists to use their Sat-Nav in order to re-join the motorway.
Learner drivers taking the theory test since 2016 will be familiar with the rules. Today, in our blog we explain how the diversion system works.
Follow The Symbol To Re-join The Motorway
In the event of motorway collision, the Gardaí will close the road at the previous junction and traffic will be forced off the motorway.
The diversion signs will direct motorists to follow a particular symbol which will allow the driver to re-join the motorway at the next junction.
The diversion routes are selected so that all types of vehicles can use the suggested detour. For example, roads which involve bridges would only be selected if large trucks would be able to pass underneath.
The road network tends to favour solid black shapes placed on yellow backgrounds. However, where there is a large number of diversion routes in one location, there may be diversion signs that use hollow symbols. In total, there can be eight variations.
Motorists familiar with the M50 will have seen the symbols beside junctions around Ballymun, Finglas, Blanchardstown, Lucan, Red Cow and Sandyford. Transport Infrastructure Ireland liaises with the relevant Local Authorities when considering introducing new diversion routes.
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