DFI/2021-0118: Environmental Information Regulations 2004 request for details of any information held by the Department for Infrastructure of consideration, since the Assembly election of 2011, of: 1) any costs & benefits of switching to metric measurements for speed limit & distance signs in Northern Ireland; 2) how such a change would be effected; & 3) whether the change from imperial to metric units of measurement on road signage should happen or not.