I drive regularly to Galway and have a love/hate relationship with the M6. It has certainly saved me a lot of time but I find it soooo boring. On top of that there aren't many geocaches along the route. As a result I decided to set up a series along it to provide drivers with a break and to make the journey a bit more interesting. None of the hides will be particularly difficult or exciting but at least you can stretch your legs. There will be no room for swaps.
This one is at the Athlone services.
You are looking for a magnetic bolt. BYOP.