As Minister for Transport I have responsibility for overall policy and securing exchequer funding in relation to the National Roads Programme. Under the Roads Acts 1993-2015 and in line with the National Development Plan (NDP), the operation and management of individual national roads is a matter for Transport Infrastructure Ireland (TII), in conjunction with the local authorities concerned.
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.
More generally, I welcome any initiatives to reduce energy use and wastage which can be achieved without compromising safety, which I understand to be the case in relation to recent measures by TII, in conjunction with the local authorities.