As Minister for Transport, Tourism and Sport, I have responsibility for overall policy in relation to roads. The planning, design and implementation of individual road projects on national roads are a matter for Transport Infrastructure Ireland under the Roads Acts 1993-2015 in conjunction with the relevant local authority. For regional and local roads it is a matter for each respective local authority.
My Department is currently working on an update to the Traffic Signs Manual and is expected to be published shortly. This will provide updated guidance on the matter.
Noting the above position, I have also referred the question to TII for a direct reply. Please advise my private office if you do not receive a reply within 10 working days.