As Minister for Climate, Energy, Communications and Transport, Tourism and Sport, I have responsibility for overall policy and securing exchequer funding in relation to the National Roads Programme. Under the Roads Acts 1993-2015 the operation and management of individual national roads is a matter for Transport Infrastructure Ireland (TII), in conjunction with the local authorities concerned.
In this context, TII is best placed to advise you on the cost of introducing a nationwide accident signalling system on major roadways.
Noting the above position, I have referred your question to TII for a direct reply. Please advise my private office if you do not receive a reply within 10 working days.